diff --git a/common-web/src/main/java/com/baiyue/common/web/GlobalExceptionHandler.java b/common-web/src/main/java/com/baiyue/common/web/GlobalExceptionHandler.java
index 8d238f621..cb299bda9 100644
--- a/common-web/src/main/java/com/baiyue/common/web/GlobalExceptionHandler.java
+++ b/common-web/src/main/java/com/baiyue/common/web/GlobalExceptionHandler.java
@@ -94,12 +94,21 @@ public class GlobalExceptionHandler {
     private ResponseEntity<ApiResponse<Map<String, String>>> validationResponse(
             Map<String, String> errors, HttpServletRequest request) {
         ResultCode code = ResultCode.VALIDATION_FAILED;
-        ApiResponse<Map<String, String>> body = ApiResponse.of(code, code.message(), errors,
+        ApiResponse<Map<String, String>> body = ApiResponse.of(code, validationMessage(errors), errors,
                 CorrelationContext.requestId(request), CorrelationContext.traceId(request));
         recordFailure(code);
         return ResponseEntity.ok(body);
     }
 
+    private String validationMessage(Map<String, String> errors) {
+        if (errors.isEmpty()) {
+            return ResultCode.VALIDATION_FAILED.message();
+        }
+        return errors.entrySet().stream()
+                .map(entry -> entry.getKey() + ": " + entry.getValue())
+                .collect(java.util.stream.Collectors.joining("；"));
+    }
+
     private ResponseEntity<ApiResponse<Void>> failure(ResultCode code, String message,
                                                        HttpServletRequest request) {
         ApiResponse<Void> body = ApiResponse.failure(code, message,
diff --git a/common-web/src/test/java/com/baiyue/common/web/GlobalExceptionHandlerTest.java b/common-web/src/test/java/com/baiyue/common/web/GlobalExceptionHandlerTest.java
index d2c6c808b..0df079856 100644
--- a/common-web/src/test/java/com/baiyue/common/web/GlobalExceptionHandlerTest.java
+++ b/common-web/src/test/java/com/baiyue/common/web/GlobalExceptionHandlerTest.java
@@ -7,6 +7,9 @@ import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.core.MethodParameter;
+import org.springframework.validation.BeanPropertyBindingResult;
+import org.springframework.validation.BindException;
+import org.springframework.validation.FieldError;
 import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
 import org.springframework.test.util.ReflectionTestUtils;
 
@@ -43,6 +46,21 @@ class GlobalExceptionHandlerTest {
         assertThat(response.getBody().code()).isEqualTo(ResultCode.BAD_REQUEST.code());
     }
 
+    @Test
+    void validationDetailsAreIncludedInMessageAndData() {
+        MockHttpServletRequest request = new MockHttpServletRequest();
+        BeanPropertyBindingResult bindingResult = new BeanPropertyBindingResult(new Object(), "request");
+        bindingResult.addError(new FieldError("request", "carrierId", "不能为null"));
+        bindingResult.addError(new FieldError("request", "carrierName", "不能为空"));
+
+        var response = handler.handleBinding(new BindException(bindingResult), request);
+
+        assertThat(response.getBody().code()).isEqualTo(ResultCode.VALIDATION_FAILED.code());
+        assertThat(response.getBody().message()).isEqualTo("carrierId: 不能为null；carrierName: 不能为空");
+        assertThat(response.getBody().data()).containsEntry("carrierId", "不能为null")
+                .containsEntry("carrierName", "不能为空");
+    }
+
     @Test
     void recordsBusinessFailureMetricByFiniteResultCode() {
         SimpleMeterRegistry registry = new SimpleMeterRegistry();
diff --git a/deploy/sql/README.md b/deploy/sql/README.md
index 2c11ba65a..3ebd532c5 100644
--- a/deploy/sql/README.md
+++ b/deploy/sql/README.md
@@ -186,6 +186,28 @@ SELECT
 
 上述三个结果 `public_scope_violations`、`customer_scope_violations`、`parent_child_scope_mismatches` 必须都为 `0`。
 
+## 船司 FBA 价格公共作用域迁移
+
+- `fl_carrier_fba_rate` 的船司 FBA 价格固定归平台作用域 `tenant_id = 0`；客户计费规则仍按客户 `tenant_id > 0` 隔离。
+- 固定入口会先检查存量价格的 `(rate_code, rate_version)` 重复，以及相同匹配维度的有效期重叠；发现冲突时通过 `SQLSTATE 45000` 中止，不会自动覆盖价格。
+- 无冲突时，固定入口才会把存量船司价格迁移到 `tenant_id = 0`，并在末尾验证不存在非平台价格作用域。迁移完成后再启动或重启 `firstleg-service`。
+
+执行前可只读盘点：
+
+```sql
+SELECT tenant_id, COUNT(*) AS total
+  FROM baiyue_firstleg.fl_carrier_fba_rate
+ GROUP BY tenant_id
+ ORDER BY tenant_id;
+
+SELECT rate_code, rate_version, COUNT(*) AS total
+  FROM baiyue_firstleg.fl_carrier_fba_rate
+ GROUP BY rate_code, rate_version
+HAVING COUNT(*) > 1;
+```
+
+如果固定入口因价格冲突中止，应先由业务确认保留版本、有效期和价格金额，再清理冲突后重新完整执行脚本；不要直接手工把冲突记录改为 `0`。
+
 ## 海外仓阶梯费用增量
 
 - `2026-08-05` 增量已追加到固定入口末尾，不创建新的日期部署脚本。
diff --git a/deploy/sql/头程数据库统一增量-MySQL8.sql b/deploy/sql/头程数据库统一增量-MySQL8.sql
index 6ff72d6a6..accdd4f6e 100644
--- a/deploy/sql/头程数据库统一增量-MySQL8.sql
+++ b/deploy/sql/头程数据库统一增量-MySQL8.sql
@@ -2527,8 +2527,8 @@ CREATE TABLE IF NOT EXISTS fl_customer_charge_rule (
 
 CREATE TABLE IF NOT EXISTS fl_carrier_fba_rate (
   id BIGINT UNSIGNED NOT NULL COMMENT '船司FBA价格ID',
-  tenant_id BIGINT UNSIGNED NOT NULL COMMENT '数据所属租户ID',
-  rate_code VARCHAR(50) NOT NULL COMMENT '租户内价格编码',
+  tenant_id BIGINT UNSIGNED NOT NULL COMMENT '平台价格作用域ID，船司价格固定为0',
+  rate_code VARCHAR(50) NOT NULL COMMENT '平台公共价格编码',
   rate_version INT UNSIGNED NOT NULL COMMENT '价格版本号',
   origin_warehouse_id BIGINT UNSIGNED NOT NULL COMMENT '起运仓逻辑ID',
   origin_warehouse_name VARCHAR(128) NOT NULL COMMENT '起运仓名称快照',
@@ -3053,6 +3053,61 @@ PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;
 
 DROP PROCEDURE IF EXISTS phase2_fba_add_column;
 
+-- 船司 FBA 价格是平台公共主数据；迁移前检查版本和有效期冲突，避免静默覆盖客户价格。
+DROP PROCEDURE IF EXISTS phase2_fba_migrate_carrier_rate_scope;
+DELIMITER $$
+CREATE PROCEDURE phase2_fba_migrate_carrier_rate_scope()
+BEGIN
+  DECLARE v_conflicts INT DEFAULT 0;
+
+  SELECT COUNT(*) INTO v_conflicts
+  FROM (
+    SELECT rate_code, rate_version
+    FROM fl_carrier_fba_rate
+    GROUP BY rate_code, rate_version
+    HAVING COUNT(*) > 1
+  ) AS duplicate_versions;
+  IF v_conflicts > 0 THEN
+    SIGNAL SQLSTATE '45000'
+      SET MESSAGE_TEXT = 'FBA价格迁移失败：不同客户存在重复价格编码版本，请先合并';
+  END IF;
+
+  SELECT COUNT(*) INTO v_conflicts
+  FROM (
+    SELECT first_rate.id
+    FROM fl_carrier_fba_rate first_rate
+    JOIN fl_carrier_fba_rate second_rate
+      ON first_rate.id < second_rate.id
+     AND first_rate.status = 'ACTIVE'
+     AND second_rate.status = 'ACTIVE'
+     AND first_rate.origin_warehouse_id <=> second_rate.origin_warehouse_id
+     AND first_rate.business_type <=> second_rate.business_type
+     AND first_rate.channel_code <=> second_rate.channel_code
+     AND first_rate.carrier_id <=> second_rate.carrier_id
+     AND first_rate.destination_code <=> second_rate.destination_code
+     AND first_rate.charge_unit <=> second_rate.charge_unit
+     AND first_rate.effective_from < COALESCE(second_rate.effective_to, '9999-12-31 23:59:59.999')
+     AND second_rate.effective_from < COALESCE(first_rate.effective_to, '9999-12-31 23:59:59.999')
+     LIMIT 1
+  ) AS overlapping_rates;
+  IF v_conflicts > 0 THEN
+    SIGNAL SQLSTATE '45000'
+      SET MESSAGE_TEXT = 'FBA价格迁移失败：公共匹配维度存在有效期重叠，请先合并';
+  END IF;
+
+  UPDATE fl_carrier_fba_rate
+  SET tenant_id = 0
+  WHERE tenant_id <> 0;
+
+  IF EXISTS (SELECT 1 FROM fl_carrier_fba_rate WHERE tenant_id <> 0) THEN
+    SIGNAL SQLSTATE '45000'
+      SET MESSAGE_TEXT = 'FBA价格迁移失败：仍存在非平台价格作用域';
+  END IF;
+END$$
+DELIMITER ;
+CALL phase2_fba_migrate_carrier_rate_scope();
+DROP PROCEDURE IF EXISTS phase2_fba_migrate_carrier_rate_scope;
+
 -- 旧索引可能缺少业务类型、船司和结束时间；用新索引名并存，避免破坏线上依赖。
 SET @idx_exists = (SELECT COUNT(*) FROM information_schema.STATISTICS
   WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = 'fl_carrier_fba_rate' AND INDEX_NAME = 'idx_fba_rate_unique_match');
diff --git a/firstleg/src/main/java/com/baiyue/firstleg/controller/PlatformFbaMasterDataController.java b/firstleg/src/main/java/com/baiyue/firstleg/controller/PlatformFbaMasterDataController.java
index 4ad0fdf8f..80d64f61b 100644
--- a/firstleg/src/main/java/com/baiyue/firstleg/controller/PlatformFbaMasterDataController.java
+++ b/firstleg/src/main/java/com/baiyue/firstleg/controller/PlatformFbaMasterDataController.java
@@ -75,19 +75,20 @@ public class PlatformFbaMasterDataController {
 
     @GetMapping("/carrier-rates")
     @PreAuthorize("hasAuthority('firstleg:fba-pricing:rate:view')")
-    @Operation(summary = "查询船司 FBA 价格版本", description = "默认查询全部企业；tenantId 可用于筛选目标企业")
+    @Operation(summary = "查询船司 FBA 价格版本", description = "查询平台公共价格；所有客户共享")
     public ApiResponse<List<CarrierFbaRateEntity>> rates(
         @AuthenticationPrincipal AuthenticatedUser user,
-        @RequestParam(required = false) Long tenantId,
         @RequestParam(required = false) String rateCode) {
-        return ApiResponse.success(service.listRates(optionalPlatformTenant(user, tenantId), rateCode));
+        FirstlegScopeGuard.platform(user);
+        return ApiResponse.success(service.listRates(rateCode));
     }
 
     @GetMapping("/carrier-rates/{id}")
     @PreAuthorize("hasAuthority('firstleg:fba-pricing:rate:view')")
     public ApiResponse<CarrierFbaRateEntity> rate(
-        @AuthenticationPrincipal AuthenticatedUser user, @RequestParam long tenantId, @PathVariable long id) {
-        return ApiResponse.success(service.rate(FirstlegScopeGuard.platform(user, tenantId), id));
+        @AuthenticationPrincipal AuthenticatedUser user, @PathVariable long id) {
+        FirstlegScopeGuard.platform(user);
+        return ApiResponse.success(service.rate(id));
     }
 
     @PostMapping("/carrier-rates/versions")
@@ -95,10 +96,10 @@ public class PlatformFbaMasterDataController {
     @BusinessAudit(event = "FBA_RATE_VERSION_CREATE", resourceType = "CARRIER_FBA_RATE",
         description = "创建船司FBA价格版本")
     public ApiResponse<CarrierFbaRateEntity> createRate(
-        @AuthenticationPrincipal AuthenticatedUser user, @RequestParam long tenantId,
+        @AuthenticationPrincipal AuthenticatedUser user,
         @Valid @RequestBody CarrierRateVersionRequest request) {
-        long scope = FirstlegScopeGuard.platform(user, tenantId);
-        return ApiResponse.success(service.createRateVersion(scope, user.userId(), request));
+        FirstlegScopeGuard.platform(user);
+        return ApiResponse.success(service.createRateVersion(user.userId(), request));
     }
 
     @DeleteMapping("/carrier-rates/{id}")
@@ -106,8 +107,9 @@ public class PlatformFbaMasterDataController {
     @BusinessAudit(event = "FBA_RATE_RETIRE", resourceType = "CARRIER_FBA_RATE", resourceId = "#id",
         description = "停用船司FBA价格版本")
     public ApiResponse<Void> retireRate(@AuthenticationPrincipal AuthenticatedUser user,
-                                        @RequestParam long tenantId, @PathVariable long id) {
-        service.retireRate(FirstlegScopeGuard.platform(user, tenantId), id, user.userId());
+                                        @PathVariable long id) {
+        FirstlegScopeGuard.platform(user);
+        service.retireRate(id, user.userId());
         return ApiResponse.success(null);
     }
 
diff --git a/firstleg/src/main/java/com/baiyue/firstleg/entity/CarrierFbaRateEntity.java b/firstleg/src/main/java/com/baiyue/firstleg/entity/CarrierFbaRateEntity.java
index 9dd81bd6a..892552ecc 100644
--- a/firstleg/src/main/java/com/baiyue/firstleg/entity/CarrierFbaRateEntity.java
+++ b/firstleg/src/main/java/com/baiyue/firstleg/entity/CarrierFbaRateEntity.java
@@ -15,6 +15,9 @@ import java.time.LocalDateTime;
 @Setter
 @TableName("fl_carrier_fba_rate")
 public class CarrierFbaRateEntity extends BaseEntity {
+    /** 船司价格是平台公共主数据，不绑定任何客户。 */
+    public static final long PLATFORM_SCOPE = 0L;
+
     @TableId(type = IdType.ASSIGN_ID)
     private Long id;
     private Long tenantId;
diff --git a/firstleg/src/main/java/com/baiyue/firstleg/repository/FbaPricingRepository.java b/firstleg/src/main/java/com/baiyue/firstleg/repository/FbaPricingRepository.java
index 448445e87..82e14bcac 100644
--- a/firstleg/src/main/java/com/baiyue/firstleg/repository/FbaPricingRepository.java
+++ b/firstleg/src/main/java/com/baiyue/firstleg/repository/FbaPricingRepository.java
@@ -50,9 +50,9 @@ public class FbaPricingRepository {
             .eq(CustomerChargeRuleEntity::getId, id));
     }
 
-    public CarrierFbaRateEntity findRate(long tenantId, long id) {
+    public CarrierFbaRateEntity findRate(long id) {
         return rates.selectOne(new LambdaQueryWrapper<CarrierFbaRateEntity>()
-            .eq(CarrierFbaRateEntity::getTenantId, tenantId)
+            .eq(CarrierFbaRateEntity::getTenantId, CarrierFbaRateEntity.PLATFORM_SCOPE)
             .eq(CarrierFbaRateEntity::getId, id));
     }
 
@@ -64,21 +64,34 @@ public class FbaPricingRepository {
             .orderByDesc(CustomerChargeRuleEntity::getRuleVersion));
     }
 
-    public List<CarrierFbaRateEntity> listRates(Long tenantId, String rateCode) {
+    public List<CarrierFbaRateEntity> listRates(String rateCode) {
         return rates.selectList(new LambdaQueryWrapper<CarrierFbaRateEntity>()
-            .eq(tenantId != null, CarrierFbaRateEntity::getTenantId, tenantId)
+            .eq(CarrierFbaRateEntity::getTenantId, CarrierFbaRateEntity.PLATFORM_SCOPE)
             .eq(rateCode != null && !rateCode.isBlank(), CarrierFbaRateEntity::getRateCode, rateCode)
             .orderByAsc(CarrierFbaRateEntity::getRateCode)
             .orderByDesc(CarrierFbaRateEntity::getRateVersion));
     }
 
+    /**
+     * 在创建平台公共价格版本时锁定当前公共价格集合，串行化版本号和有效期检查。
+     * 调用方必须在事务中使用该方法。
+     */
+    public List<CarrierFbaRateEntity> listRatesForUpdate(String rateCode) {
+        return rates.selectList(new LambdaQueryWrapper<CarrierFbaRateEntity>()
+            .eq(CarrierFbaRateEntity::getTenantId, CarrierFbaRateEntity.PLATFORM_SCOPE)
+            .eq(rateCode != null && !rateCode.isBlank(), CarrierFbaRateEntity::getRateCode, rateCode)
+            .orderByAsc(CarrierFbaRateEntity::getRateCode)
+            .orderByDesc(CarrierFbaRateEntity::getRateVersion)
+            .last("FOR UPDATE"));
+    }
+
     public int nextRuleVersion(long tenantId, String ruleCode) {
         List<CustomerChargeRuleEntity> values = listRules(tenantId, ruleCode);
         return values.isEmpty() ? 1 : values.get(0).getRuleVersion() + 1;
     }
 
-    public int nextRateVersion(long tenantId, String rateCode) {
-        List<CarrierFbaRateEntity> values = listRates(tenantId, rateCode);
+    public int nextRateVersion(String rateCode) {
+        List<CarrierFbaRateEntity> values = listRatesForUpdate(rateCode);
         return values.isEmpty() ? 1 : values.get(0).getRateVersion() + 1;
     }
 
@@ -91,9 +104,9 @@ public class FbaPricingRepository {
             .set(CustomerChargeRuleEntity::getUpdatedBy, operatorId));
     }
 
-    public int retireRate(long tenantId, long id, long operatorId) {
+    public int retireRate(long id, long operatorId) {
         return rates.update(null, new LambdaUpdateWrapper<CarrierFbaRateEntity>()
-            .eq(CarrierFbaRateEntity::getTenantId, tenantId)
+            .eq(CarrierFbaRateEntity::getTenantId, CarrierFbaRateEntity.PLATFORM_SCOPE)
             .eq(CarrierFbaRateEntity::getId, id)
             .eq(CarrierFbaRateEntity::getStatus, "ACTIVE")
             .set(CarrierFbaRateEntity::getStatus, "INACTIVE")
@@ -121,7 +134,7 @@ public class FbaPricingRepository {
     public List<CarrierFbaRateEntity> matchRates(InboundPricingEntity inbound, String chargeUnit,
                                                   LocalDateTime at) {
         return rates.selectList(new LambdaQueryWrapper<CarrierFbaRateEntity>()
-            .eq(CarrierFbaRateEntity::getTenantId, inbound.getTenantId())
+            .eq(CarrierFbaRateEntity::getTenantId, CarrierFbaRateEntity.PLATFORM_SCOPE)
             .eq(CarrierFbaRateEntity::getOriginWarehouseId, inbound.getWarehouseId())
             .eq(CarrierFbaRateEntity::getBusinessType, inbound.getBusinessType())
             .eq(CarrierFbaRateEntity::getChannelCode, inbound.getChannelCode())
diff --git a/firstleg/src/main/java/com/baiyue/firstleg/service/FbaMasterDataService.java b/firstleg/src/main/java/com/baiyue/firstleg/service/FbaMasterDataService.java
index 59b60be6a..4a9afefe0 100644
--- a/firstleg/src/main/java/com/baiyue/firstleg/service/FbaMasterDataService.java
+++ b/firstleg/src/main/java/com/baiyue/firstleg/service/FbaMasterDataService.java
@@ -59,10 +59,9 @@ public class FbaMasterDataService {
     }
 
     @Transactional
-    public CarrierFbaRateEntity createRateVersion(long tenantId, long operatorId,
-                                                   CarrierRateVersionRequest request) {
+    public CarrierFbaRateEntity createRateVersion(long operatorId, CarrierRateVersionRequest request) {
         validatePeriod(request.effectiveFrom(), request.effectiveTo());
-        boolean overlaps = repository.listRates(tenantId, null).stream()
+        boolean overlaps = repository.listRatesForUpdate(null).stream()
             .filter(v -> "ACTIVE".equals(v.getStatus()))
             .filter(v -> Objects.equals(v.getOriginWarehouseId(), request.originWarehouseId()))
             .filter(v -> Objects.equals(v.getBusinessType(), request.businessType()))
@@ -75,9 +74,9 @@ public class FbaMasterDataService {
         if (overlaps) throw conflict("船司 FBA 价格有效期重叠，无法保证唯一匹配");
 
         CarrierFbaRateEntity value = new CarrierFbaRateEntity();
-        value.setTenantId(tenantId);
+        value.setTenantId(CarrierFbaRateEntity.PLATFORM_SCOPE);
         value.setRateCode(request.rateCode());
-        value.setRateVersion(repository.nextRateVersion(tenantId, request.rateCode()));
+        value.setRateVersion(repository.nextRateVersion(request.rateCode()));
         value.setOriginWarehouseId(request.originWarehouseId());
         value.setOriginWarehouseName(request.originWarehouseName());
         value.setBusinessType(request.businessType());
@@ -103,8 +102,8 @@ public class FbaMasterDataService {
         return repository.listRules(tenantId, code);
     }
 
-    public List<CarrierFbaRateEntity> listRates(Long tenantId, String code) {
-        return repository.listRates(tenantId, code);
+    public List<CarrierFbaRateEntity> listRates(String code) {
+        return repository.listRates(code);
     }
 
     public CustomerChargeRuleEntity rule(long tenantId, long id) {
@@ -113,8 +112,8 @@ public class FbaMasterDataService {
         return value;
     }
 
-    public CarrierFbaRateEntity rate(long tenantId, long id) {
-        CarrierFbaRateEntity value = repository.findRate(tenantId, id);
+    public CarrierFbaRateEntity rate(long id) {
+        CarrierFbaRateEntity value = repository.findRate(id);
         if (value == null) throw new BizException(ResultCode.NOT_FOUND, "船司 FBA 价格版本不存在");
         return value;
     }
@@ -125,8 +124,8 @@ public class FbaMasterDataService {
     }
 
     @Transactional
-    public void retireRate(long tenantId, long id, long operatorId) {
-        if (repository.retireRate(tenantId, id, operatorId) != 1) throw conflict("价格已停用或不存在");
+    public void retireRate(long id, long operatorId) {
+        if (repository.retireRate(id, operatorId) != 1) throw conflict("价格已停用或不存在");
     }
 
     private static void validatePeriod(LocalDateTime from, LocalDateTime to) {
diff --git a/firstleg/src/main/resources/db/phase2-fba-pricing-migration.sql b/firstleg/src/main/resources/db/phase2-fba-pricing-migration.sql
index 5024450c5..5c5cb23d0 100644
--- a/firstleg/src/main/resources/db/phase2-fba-pricing-migration.sql
+++ b/firstleg/src/main/resources/db/phase2-fba-pricing-migration.sql
@@ -56,6 +56,61 @@ SET @sql = IF(@resource_tenant_needs_modify > 0,
   'SELECT 1');
 PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;
 
+-- 船司 FBA 价格是平台公共主数据；迁移前检查版本和有效期冲突，避免静默覆盖客户价格。
+DROP PROCEDURE IF EXISTS phase2_fba_migrate_carrier_rate_scope;
+DELIMITER $$
+CREATE PROCEDURE phase2_fba_migrate_carrier_rate_scope()
+BEGIN
+  DECLARE v_conflicts INT DEFAULT 0;
+
+  SELECT COUNT(*) INTO v_conflicts
+  FROM (
+    SELECT rate_code, rate_version
+    FROM fl_carrier_fba_rate
+    GROUP BY rate_code, rate_version
+    HAVING COUNT(*) > 1
+  ) AS duplicate_versions;
+  IF v_conflicts > 0 THEN
+    SIGNAL SQLSTATE '45000'
+      SET MESSAGE_TEXT = 'FBA价格迁移失败：不同客户存在重复价格编码版本，请先合并';
+  END IF;
+
+  SELECT COUNT(*) INTO v_conflicts
+  FROM (
+    SELECT first_rate.id
+    FROM fl_carrier_fba_rate first_rate
+    JOIN fl_carrier_fba_rate second_rate
+      ON first_rate.id < second_rate.id
+     AND first_rate.status = 'ACTIVE'
+     AND second_rate.status = 'ACTIVE'
+     AND first_rate.origin_warehouse_id <=> second_rate.origin_warehouse_id
+     AND first_rate.business_type <=> second_rate.business_type
+     AND first_rate.channel_code <=> second_rate.channel_code
+     AND first_rate.carrier_id <=> second_rate.carrier_id
+     AND first_rate.destination_code <=> second_rate.destination_code
+     AND first_rate.charge_unit <=> second_rate.charge_unit
+     AND first_rate.effective_from < COALESCE(second_rate.effective_to, '9999-12-31 23:59:59.999')
+     AND second_rate.effective_from < COALESCE(first_rate.effective_to, '9999-12-31 23:59:59.999')
+    LIMIT 1
+  ) AS overlapping_rates;
+  IF v_conflicts > 0 THEN
+    SIGNAL SQLSTATE '45000'
+      SET MESSAGE_TEXT = 'FBA价格迁移失败：公共匹配维度存在有效期重叠，请先合并';
+  END IF;
+
+  UPDATE fl_carrier_fba_rate
+  SET tenant_id = 0
+  WHERE tenant_id <> 0;
+
+  IF EXISTS (SELECT 1 FROM fl_carrier_fba_rate WHERE tenant_id <> 0) THEN
+    SIGNAL SQLSTATE '45000'
+      SET MESSAGE_TEXT = 'FBA价格迁移失败：仍存在非平台价格作用域';
+  END IF;
+END$$
+DELIMITER ;
+CALL phase2_fba_migrate_carrier_rate_scope();
+DROP PROCEDURE IF EXISTS phase2_fba_migrate_carrier_rate_scope;
+
 DROP PROCEDURE IF EXISTS phase2_fba_add_column;
 
 -- 旧索引可能缺少业务类型、船司和结束时间；用新索引名并存，避免破坏线上依赖。
diff --git a/firstleg/src/main/resources/db/phase2-inbound-schema.sql b/firstleg/src/main/resources/db/phase2-inbound-schema.sql
index aaf7ad059..21c363eb4 100644
--- a/firstleg/src/main/resources/db/phase2-inbound-schema.sql
+++ b/firstleg/src/main/resources/db/phase2-inbound-schema.sql
@@ -309,8 +309,8 @@ CREATE TABLE IF NOT EXISTS fl_customer_charge_rule (
 
 CREATE TABLE IF NOT EXISTS fl_carrier_fba_rate (
   id BIGINT UNSIGNED NOT NULL COMMENT '船司FBA价格ID',
-  tenant_id BIGINT UNSIGNED NOT NULL COMMENT '数据所属租户ID',
-  rate_code VARCHAR(50) NOT NULL COMMENT '租户内价格编码',
+  tenant_id BIGINT UNSIGNED NOT NULL COMMENT '平台价格作用域ID，船司价格固定为0',
+  rate_code VARCHAR(50) NOT NULL COMMENT '平台公共价格编码',
   rate_version INT UNSIGNED NOT NULL COMMENT '价格版本号',
   origin_warehouse_id BIGINT UNSIGNED NOT NULL COMMENT '起运仓逻辑ID',
   origin_warehouse_name VARCHAR(128) NOT NULL COMMENT '起运仓名称快照',
diff --git a/firstleg/src/main/resources/openapi/fba-pricing-v1.yaml b/firstleg/src/main/resources/openapi/fba-pricing-v1.yaml
index c0038edae..cdf5048db 100644
--- a/firstleg/src/main/resources/openapi/fba-pricing-v1.yaml
+++ b/firstleg/src/main/resources/openapi/fba-pricing-v1.yaml
@@ -32,26 +32,24 @@ paths:
       responses: {'200': {description: 成功或业务失败}, '403': {description: 无权限}}
   /api/platform/v1/fba-pricing/carrier-rates:
     get:
-      summary: 查询船司 FBA 价格版本
+      summary: 查询平台公共船司 FBA 价格版本
       description: 需要 firstleg:fba-pricing:rate:view 权限
       parameters:
-        - {$ref: '#/components/parameters/OptionalTenantId'}
         - {name: rateCode, in: query, schema: {type: string, maxLength: 50}}
       responses: {'200': {description: 成功或业务失败}, '403': {description: 无权限}}
   /api/platform/v1/fba-pricing/carrier-rates/versions:
     post:
-      summary: 新建船司 FBA 价格版本
-      parameters: [{$ref: '#/components/parameters/TenantId'}]
+      summary: 新建平台公共船司 FBA 价格版本
       requestBody: {required: true, content: {application/json: {schema: {$ref: '#/components/schemas/CarrierRateVersionRequest'}}}}
       responses: {'200': {description: 成功或业务失败}, '403': {description: 无权限}}
   /api/platform/v1/fba-pricing/carrier-rates/{id}:
     get:
       summary: 查询船司 FBA 价格版本详情
-      parameters: [{$ref: '#/components/parameters/TenantId'}, {$ref: '#/components/parameters/Id'}]
+      parameters: [{$ref: '#/components/parameters/Id'}]
       responses: {'200': {description: 成功或业务失败}, '403': {description: 无权限}}
     delete:
       summary: 停用船司 FBA 价格版本
-      parameters: [{$ref: '#/components/parameters/TenantId'}, {$ref: '#/components/parameters/Id'}]
+      parameters: [{$ref: '#/components/parameters/Id'}]
       responses: {'200': {description: 成功或业务失败}, '403': {description: 无权限}}
   /api/platform/v1/inbounds/{inboundId}/fees/calculate:
     post:
diff --git a/firstleg/src/test/java/com/baiyue/firstleg/controller/FbaPricingContractTest.java b/firstleg/src/test/java/com/baiyue/firstleg/controller/FbaPricingContractTest.java
index cf912bf50..c689185fe 100644
--- a/firstleg/src/test/java/com/baiyue/firstleg/controller/FbaPricingContractTest.java
+++ b/firstleg/src/test/java/com/baiyue/firstleg/controller/FbaPricingContractTest.java
@@ -13,20 +13,26 @@ import static org.assertj.core.api.Assertions.assertThat;
 @DisplayName("FBA计费OpenAPI契约")
 class FbaPricingContractTest {
     @Test
-    @DisplayName("只有基础资料列表允许省略企业参数")
-    void onlyMasterDataListsAllowOptionalTenant() {
-        for (String listMethod : new String[] {"rules", "rates"}) {
-            Method method = method(listMethod);
-            assertThat(method.getParameterTypes()[1]).isEqualTo(Long.class);
-            assertThat(method.getParameters()[1].getAnnotation(RequestParam.class).required()).isFalse();
-        }
+    @DisplayName("客户规则保留客户参数，船司价格使用平台公共作用域")
+    void keepsCustomerRuleScopeAndRemovesCarrierRateTenantScope() {
+        Method rules = method("rules");
+        assertThat(rules.getParameterTypes()[1]).isEqualTo(Long.class);
+        assertThat(rules.getParameters()[1].getAnnotation(RequestParam.class).required()).isFalse();
 
-        for (String scopedMethod : new String[] {"rule", "createRule", "retireRule",
-            "rate", "createRate", "retireRate"}) {
+        Method rates = method("rates");
+        assertThat(rates.getParameterTypes()).doesNotContain(Long.class);
+
+        for (String scopedMethod : new String[] {"rule", "createRule", "retireRule"}) {
             Method method = method(scopedMethod);
             assertThat(method.getParameterTypes()[1]).isEqualTo(long.class);
             assertThat(method.getParameters()[1].getAnnotation(RequestParam.class).required()).isTrue();
         }
+
+        for (String publicMethod : new String[] {"rate", "createRate", "retireRate"}) {
+            assertThat(java.util.Arrays.stream(method(publicMethod).getParameters())
+                .map(parameter -> parameter.getAnnotation(RequestParam.class)))
+                .allMatch(annotation -> annotation == null);
+        }
     }
 
     @Test
@@ -62,7 +68,7 @@ class FbaPricingContractTest {
             openapi.indexOf("/api/platform/v1/fba-pricing/carrier-rates:"),
             openapi.indexOf("/api/platform/v1/fba-pricing/carrier-rates/versions:"));
         assertThat(carrierRates)
-            .contains("OptionalTenantId")
+            .doesNotContain("OptionalTenantId")
             .contains("name: rateCode");
         assertThat(openapi)
             .contains("OptionalTenantId: {name: tenantId, in: query, required: false")
diff --git a/firstleg/src/test/java/com/baiyue/firstleg/repository/FbaPricingRepositoryRuleListTest.java b/firstleg/src/test/java/com/baiyue/firstleg/repository/FbaPricingRepositoryRuleListTest.java
index 653c42a8b..454cfe888 100644
--- a/firstleg/src/test/java/com/baiyue/firstleg/repository/FbaPricingRepositoryRuleListTest.java
+++ b/firstleg/src/test/java/com/baiyue/firstleg/repository/FbaPricingRepositoryRuleListTest.java
@@ -8,6 +8,7 @@ import com.baomidou.mybatisplus.core.metadata.TableInfoHelper;
 import com.baiyue.firstleg.entity.CustomerChargeRuleEntity;
 import com.baiyue.firstleg.entity.CarrierFbaRateEntity;
 import com.baiyue.firstleg.entity.InboundPricingIdempotencyEntity;
+import com.baiyue.firstleg.entity.InboundPricingEntity;
 import com.baiyue.firstleg.mapper.CarrierFbaRateMapper;
 import com.baiyue.firstleg.mapper.CustomerChargeRuleMapper;
 import com.baiyue.firstleg.mapper.InboundFeeItemMapper;
@@ -48,6 +49,8 @@ class FbaPricingRepositoryRuleListTest {
             CustomerChargeRuleEntity.class);
         TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new Configuration(), "test"),
             CarrierFbaRateEntity.class);
+        TableInfoHelper.initTableInfo(new MapperBuilderAssistant(new Configuration(), "test"),
+            InboundPricingEntity.class);
     }
 
     @Test
@@ -61,14 +64,52 @@ class FbaPricingRepositoryRuleListTest {
     }
 
     @Test
-    void platformRateListOmitsTenantConditionWhenTenantIsAbsent() {
-        assertThat(rateQueryValues(null, null)).isEmpty();
+    void platformRateListAlwaysUsesPublicScope() {
+        assertThat(rateQueryValues(null)).containsExactly(CarrierFbaRateEntity.PLATFORM_SCOPE);
     }
 
     @Test
-    void platformRateListKeepsTenantAndRateCodeFiltersWhenProvided() {
-        assertThat(rateQueryValues(10001L, "RATE-1"))
-            .containsExactlyInAnyOrder(10001L, "RATE-1");
+    void platformRateListKeepsPublicScopeAndRateCodeFiltersWhenProvided() {
+        assertThat(rateQueryValues("RATE-1"))
+            .containsExactlyInAnyOrder(CarrierFbaRateEntity.PLATFORM_SCOPE, "RATE-1");
+    }
+
+    @Test
+    void platformRateCreateQueryLocksPublicScope() {
+        when(rates.selectList(org.mockito.ArgumentMatchers.any())).thenReturn(List.of());
+
+        repository.listRatesForUpdate(null);
+
+        @SuppressWarnings("unchecked")
+        ArgumentCaptor<LambdaQueryWrapper<CarrierFbaRateEntity>> wrapper =
+            ArgumentCaptor.forClass(LambdaQueryWrapper.class);
+        verify(rates).selectList(wrapper.capture());
+        assertThat(wrapper.getValue().getCustomSqlSegment()).contains("FOR UPDATE");
+        assertThat(wrapper.getValue().getParamNameValuePairs().values())
+            .containsExactly(CarrierFbaRateEntity.PLATFORM_SCOPE);
+    }
+
+    @Test
+    void carrierRateMatchingAlwaysUsesPlatformScope() {
+        InboundPricingEntity inbound = new InboundPricingEntity();
+        inbound.setTenantId(10001L);
+        inbound.setWarehouseId(21L);
+        inbound.setBusinessType("FBA_SEA");
+        inbound.setChannelCode("SEA-TAX");
+        inbound.setCarrierId(31L);
+        inbound.setDestinationCode("ONT8");
+        when(rates.selectList(org.mockito.ArgumentMatchers.any())).thenReturn(List.of());
+
+        repository.matchRates(inbound, "KG", java.time.LocalDateTime.of(2026, 8, 1, 0, 0));
+
+        @SuppressWarnings("unchecked")
+        ArgumentCaptor<LambdaQueryWrapper<CarrierFbaRateEntity>> wrapper =
+            ArgumentCaptor.forClass(LambdaQueryWrapper.class);
+        verify(rates).selectList(wrapper.capture());
+        wrapper.getValue().getSqlSegment();
+        assertThat(wrapper.getValue().getParamNameValuePairs().values())
+            .contains(CarrierFbaRateEntity.PLATFORM_SCOPE)
+            .doesNotContain(10001L);
     }
 
     @Test
@@ -122,10 +163,10 @@ class FbaPricingRepositoryRuleListTest {
         return wrapper.getValue().getParamNameValuePairs().values();
     }
 
-    private Collection<Object> rateQueryValues(Long tenantId, String rateCode) {
+    private Collection<Object> rateQueryValues(String rateCode) {
         when(rates.selectList(org.mockito.ArgumentMatchers.any())).thenReturn(List.of());
 
-        repository.listRates(tenantId, rateCode);
+        repository.listRates(rateCode);
 
         @SuppressWarnings("unchecked")
         ArgumentCaptor<LambdaQueryWrapper<CarrierFbaRateEntity>> wrapper =
diff --git a/firstleg/src/test/java/com/baiyue/firstleg/repository/InboundWorkflowSqlContractTest.java b/firstleg/src/test/java/com/baiyue/firstleg/repository/InboundWorkflowSqlContractTest.java
index 36a47d521..fec46d05c 100644
--- a/firstleg/src/test/java/com/baiyue/firstleg/repository/InboundWorkflowSqlContractTest.java
+++ b/firstleg/src/test/java/com/baiyue/firstleg/repository/InboundWorkflowSqlContractTest.java
@@ -38,4 +38,18 @@ class InboundWorkflowSqlContractTest {
             .contains("SET warehouse_resource_tenant_id = 0")
             .contains("MODIFY COLUMN warehouse_resource_tenant_id BIGINT UNSIGNED NOT NULL");
     }
+
+    @Test
+    @DisplayName("船司价格存量迁移固定到平台作用域并拒绝冲突")
+    void shouldMigrateCarrierRatesToPublicScopeWithoutOverwritingConflicts() throws Exception {
+        String migration = new ClassPathResource("db/phase2-fba-pricing-migration.sql")
+            .getContentAsString(StandardCharsets.UTF_8);
+
+        assertThat(migration)
+            .contains("phase2_fba_migrate_carrier_rate_scope")
+            .contains("GROUP BY rate_code, rate_version")
+            .contains("公共匹配维度存在有效期重叠")
+            .contains("SET tenant_id = 0")
+            .contains("WHERE tenant_id <> 0");
+    }
 }
diff --git a/firstleg/src/test/java/com/baiyue/firstleg/service/FbaMasterDataServiceTest.java b/firstleg/src/test/java/com/baiyue/firstleg/service/FbaMasterDataServiceTest.java
index b0e85db55..dec7edf1d 100644
--- a/firstleg/src/test/java/com/baiyue/firstleg/service/FbaMasterDataServiceTest.java
+++ b/firstleg/src/test/java/com/baiyue/firstleg/service/FbaMasterDataServiceTest.java
@@ -2,6 +2,8 @@ package com.baiyue.firstleg.service;
 
 import com.baiyue.common.core.exception.BizException;
 import com.baiyue.firstleg.dto.FbaPricingDtos.CustomerRuleVersionRequest;
+import com.baiyue.firstleg.dto.FbaPricingDtos.CarrierRateVersionRequest;
+import com.baiyue.firstleg.entity.CarrierFbaRateEntity;
 import com.baiyue.firstleg.entity.CustomerChargeRuleEntity;
 import com.baiyue.firstleg.repository.FbaPricingRepository;
 import jakarta.annotation.Resource;
@@ -73,11 +75,33 @@ class FbaMasterDataServiceTest {
             .hasMessageContaining("有效期重叠");
     }
 
+    @Test
+    @DisplayName("船司价格版本固定写入平台公共作用域")
+    void createsCarrierRateInPlatformScope() {
+        when(repository.listRatesForUpdate(null)).thenReturn(List.of());
+        when(repository.nextRateVersion("RATE-1")).thenReturn(1);
+        doAnswer(invocation -> { ((CarrierFbaRateEntity) invocation.getArgument(0)).setId(20L); return null; })
+            .when(repository).insertRate(any());
+
+        CarrierFbaRateEntity created = service.createRateVersion(2L, carrierRateRequest());
+
+        assertThat(created.getTenantId()).isEqualTo(CarrierFbaRateEntity.PLATFORM_SCOPE);
+        verify(repository).listRatesForUpdate(null);
+        verify(repository).nextRateVersion("RATE-1");
+        verify(repository).insertRate(any());
+    }
+
     private CustomerRuleVersionRequest request(LocalDateTime from, LocalDateTime to) {
         return new CustomerRuleVersionRequest("CR-1", 100L, "客户A", "FBA_SEA", "KG",
             "TAX_INCLUDED", new BigDecimal("167"), 3, "CEILING", "USD", from, to, null);
     }
 
+    private CarrierRateVersionRequest carrierRateRequest() {
+        return new CarrierRateVersionRequest("RATE-1", 21L, "义乌仓", "FBA_SEA", "SEA-TAX",
+            31L, "船司A", "ONT8", "KG", new BigDecimal("2.50"), "USD", new BigDecimal("10"),
+            AUGUST, null, null);
+    }
+
     private CustomerChargeRuleEntity activeRule(LocalDateTime from, LocalDateTime to) {
         CustomerChargeRuleEntity value = new CustomerChargeRuleEntity();
         value.setRuleCode("CR-1"); value.setRuleVersion(1); value.setCustomerId(100L);
diff --git a/order/src/main/java/com/baiyue/order/controller/PlatformFirstLegOrderController.java b/order/src/main/java/com/baiyue/order/controller/PlatformFirstLegOrderController.java
index 481e3cc3b..06ec9cda8 100644
--- a/order/src/main/java/com/baiyue/order/controller/PlatformFirstLegOrderController.java
+++ b/order/src/main/java/com/baiyue/order/controller/PlatformFirstLegOrderController.java
@@ -155,6 +155,19 @@ public class PlatformFirstLegOrderController {
         return transit(user, tenantId, id, OrderStatus.APPROVED, null);
     }
 
+    @BusinessAudit(event = "ORDER_ASSIGN_CARRIER", resourceType = "FIRST_LEG_ORDER", resourceId = "#id", description = "指派订单承运商")
+    @Operation(summary = "指派承运商", description = "为待审核订单选择启用的公共承运商，名称快照由服务端主数据回填。")
+    @PutMapping("/{id}/carrier")
+    @PreAuthorize("hasAuthority('platform:order:approve')")
+    public ApiResponse<Void> assignCarrier(@AuthenticationPrincipal AuthenticatedUser user,
+                                           @Parameter(description = "目标租户 ID", required = true) @RequestParam long tenantId,
+                                           @Parameter(description = "订单 ID", required = true) @PathVariable long id,
+                                           @Valid @RequestBody OrderRequests.CarrierRequest request) {
+        long scopedTenant = OrderScopeGuard.platform(user, tenantId);
+        service.assignCarrier(scopedTenant, user.userId(), id, request);
+        return ApiResponse.success(null);
+    }
+
     @BusinessAudit(event = "ORDER_REJECT", resourceType = "FIRST_LEG_ORDER", resourceId = "#id", description = "Reject order / 驳回订单")
     @Operation(summary = "Reject / 驳回", description = "Rejects a submitted order with a required reason. / 使用必填原因驳回已提交订单。")
     @PostMapping("/{id}/reject")
diff --git a/order/src/main/java/com/baiyue/order/dto/OrderRequests.java b/order/src/main/java/com/baiyue/order/dto/OrderRequests.java
index 8e66b50ca..ab1d9fc81 100644
--- a/order/src/main/java/com/baiyue/order/dto/OrderRequests.java
+++ b/order/src/main/java/com/baiyue/order/dto/OrderRequests.java
@@ -3,6 +3,7 @@ package com.baiyue.order.dto;
 import com.baiyue.order.entity.OrderStatus;
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.Valid;
+import jakarta.validation.constraints.AssertTrue;
 import jakarta.validation.constraints.DecimalMin;
 import jakarta.validation.constraints.Email;
 import jakarta.validation.constraints.Max;
@@ -55,8 +56,10 @@ public final class OrderRequests {
             @NotBlank @Size(max = 128) String receivingWarehouseName,
             @NotBlank @Size(max = 64) String channelCode,
             @NotBlank @Size(max = 128) String channelName,
-            @NotNull Long carrierId,
-            @NotBlank @Size(max = 128) String carrierName,
+            @Schema(description = "Carrier ID snapshot; optional until the order channel resolves a carrier / 承运商 ID 快照，渠道明确承运商后可传")
+            @Min(1) Long carrierId,
+            @Schema(description = "Carrier name snapshot; optional until the order channel resolves a carrier / 承运商名称快照，渠道明确承运商后可传", maxLength = 128)
+            @Size(max = 128) String carrierName,
             @NotBlank @Pattern(regexp = "BUY_DECLARATION|TAX_REFUND") String taxMode,
             @Pattern(regexp = "FULL_CONTAINER|LCL") String containerMode,
             @NotNull Boolean customsInspection,
@@ -64,6 +67,17 @@ public final class OrderRequests {
             @Size(max = 32) String amazonWarehouseCode,
             @Size(max = 64) String shipmentId,
             @Size(max = 64) String referenceId
+    ) {
+        @AssertTrue(message = "承运商 ID 和名称必须同时填写或同时留空")
+        public boolean isCarrierSnapshotComplete() {
+            return (carrierId == null) == (carrierName == null || carrierName.isBlank());
+        }
+    }
+
+    @Schema(name = "FirstLegOrderCarrierRequest", description = "Platform carrier assignment / 平台指派承运商")
+    public record CarrierRequest(
+            @Schema(description = "Active public carrier ID / 启用的公共承运商 ID", example = "193000000000300001", requiredMode = Schema.RequiredMode.REQUIRED)
+            @NotNull @Min(1) Long carrierId
     ) {
     }
 
diff --git a/order/src/main/java/com/baiyue/order/service/OrderApplicationService.java b/order/src/main/java/com/baiyue/order/service/OrderApplicationService.java
index 9c036b27e..ed44baa9e 100644
--- a/order/src/main/java/com/baiyue/order/service/OrderApplicationService.java
+++ b/order/src/main/java/com/baiyue/order/service/OrderApplicationService.java
@@ -73,6 +73,19 @@ public class OrderApplicationService {
         updateOrderData(tenantId, userId, id, request, true);
     }
 
+    @Transactional
+    public void assignCarrier(long tenantId, long userId, long id, OrderRequests.CarrierRequest request) {
+        OrderEntity order = require(tenantId, id);
+        if (order.getStatus() != OrderStatus.SUBMITTED) {
+            throw new BizException(com.baiyue.common.core.api.ResultCode.CONFLICT, "仅待审核订单可以指派承运商");
+        }
+        var carrier = masterDataGuard.validateCarrier(request.carrierId());
+        order.setCarrierId(carrier.id());
+        order.setCarrierName(carrier.partnerName());
+        order.setUpdatedBy(userId);
+        if (repository.saveOrder(tenantId, order) != 1) throw new BizException("Concurrent order update");
+    }
+
     private void updateOrderData(long tenantId, long userId, long id, OrderRequests.SaveRequest request,
                                  boolean allowSubmitted) {
         OrderEntity order = require(tenantId, id);
@@ -105,6 +118,14 @@ public class OrderApplicationService {
             masterDataGuard.validatePersisted(tenantId, order.getCustomerId(), order.getReceivingWarehouseId(),
                 order.getDestinationWarehouseId(), order.getDestinationType());
         }
+        if (target == OrderStatus.APPROVED) {
+            if (order.getCarrierId() == null || !StringUtils.hasText(order.getCarrierName())) {
+                throw new BizException(com.baiyue.common.core.api.ResultCode.VALIDATION_FAILED,
+                    "请先选择有效承运商后再审核通过");
+            }
+            var carrier = masterDataGuard.validateCarrier(order.getCarrierId());
+            order.setCarrierName(carrier.partnerName());
+        }
         if ((target == OrderStatus.REJECTED || target == OrderStatus.CANCELLED) && !StringUtils.hasText(reason)) {
             throw new BizException("Reason is required");
         }
@@ -327,7 +348,9 @@ public class OrderApplicationService {
         order.setReceivingTime(formatReceivingTime(snapshots.receiving()));
         order.setChannelCode(request.channelCode());
         order.setChannelName(request.channelName());
-        order.setCarrierId(request.carrierId()); order.setCarrierName(request.carrierName());
+        order.setCarrierId(request.carrierId());
+        order.setCarrierName(request.carrierId() == null || !StringUtils.hasText(request.carrierName())
+            ? null : request.carrierName().trim());
         order.setTaxMode(request.taxMode());
         order.setContainerMode(request.containerMode()); order.setCustomsInspection(request.customsInspection());
         order.setDestinationType(request.destinationType());
diff --git a/order/src/main/java/com/baiyue/order/service/OrderMasterDataGuard.java b/order/src/main/java/com/baiyue/order/service/OrderMasterDataGuard.java
index 3840cb691..3bee96ab3 100644
--- a/order/src/main/java/com/baiyue/order/service/OrderMasterDataGuard.java
+++ b/order/src/main/java/com/baiyue/order/service/OrderMasterDataGuard.java
@@ -78,6 +78,37 @@ public class OrderMasterDataGuard {
             throw downstreamFailure(exception);
         }
     }
+    public PartnerClient.Partner validateCarrier(long id) {
+        try {
+            ApiResponse<PartnerClient.Partner> response;
+            try {
+                response = partners.active(token, publicTenantId, id);
+            } catch (FeignException.NotFound exception) {
+                throw new BizException(ResultCode.NOT_FOUND, "承运商不存在或不可用");
+            }
+            requireSuccessful(response, "承运商");
+            if (response.data() == null) throw unavailable("承运商");
+            var value = response.data();
+            if (!Long.valueOf(id).equals(value.id())) throw unavailable("承运商");
+            if (!Long.valueOf(publicTenantId).equals(value.tenantId()))
+                throw new BizException(ResultCode.FORBIDDEN, "承运商不属于平台公共主数据");
+            if (!"ACTIVE".equals(value.status()))
+                throw new BizException(ResultCode.CONFLICT, "承运商已停用");
+            boolean hasCarrierType = value.types() != null && value.types().contains("CARRIER");
+            boolean legacyCarrierType = (value.types() == null || value.types().isEmpty())
+                && "CARRIER".equals(value.partnerType());
+            if (!hasCarrierType && !legacyCarrierType)
+                throw new BizException(ResultCode.VALIDATION_FAILED, "所选往来单位不具备承运商类型");
+            if (!StringUtils.hasText(value.partnerName())) throw unavailable("承运商");
+            return value;
+        } catch (FeignException exception) {
+            throw downstreamFailure(exception);
+        } catch (BizException exception) {
+            throw exception;
+        } catch (RuntimeException exception) {
+            throw downstreamFailure(exception);
+        }
+    }
     private PartnerClient.Partner loadPartner(long id) {
         ApiResponse<PartnerClient.Partner> response;
         try {
diff --git a/order/src/main/resources/openapi/order-v1.yaml b/order/src/main/resources/openapi/order-v1.yaml
index 5be30c370..408cbd66d 100644
--- a/order/src/main/resources/openapi/order-v1.yaml
+++ b/order/src/main/resources/openapi/order-v1.yaml
@@ -2,7 +2,7 @@ openapi: 3.0.3
 info:
   title: 柏悦头程订单 API
   description: 业务成功和失败均使用 HTTP 200；仅响应体 code 为字符串 "200" 时表示成功，其他 code 表示失败。
-  version: 1.3.0
+  version: 1.4.0
 security:
   - bearerAuth: []
 paths:
@@ -200,6 +200,25 @@ paths:
       responses:
         '200': {description: 成功或业务失败，按响应体 code 判断}
         '403': {description: 需要 platform:order:edit 权限}
+  /api/platform/v1/orders/first-leg/{id}/carrier:
+    put:
+      summary: 为待审核订单指派承运商
+      description: 只接收承运商 ID；服务端从公共往来单位主数据校验 CARRIER 类型并写入可信名称快照。审核通过前必须完成指派。
+      parameters:
+        - $ref: '#/components/parameters/OrderId'
+        - $ref: '#/components/parameters/TenantId'
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              required: [carrierId]
+              properties:
+                carrierId: {type: string, pattern: '^[1-9][0-9]*$'}
+      responses:
+        '200': {description: 指派成功或业务失败，按响应体 code 判断}
+        '403': {description: 需要 platform:order:approve 权限}
 components:
   securitySchemes:
     bearerAuth:
diff --git a/order/src/test/java/com/baiyue/order/controller/OrderControllerPermissionTest.java b/order/src/test/java/com/baiyue/order/controller/OrderControllerPermissionTest.java
index 03870fd24..80b72d7d4 100644
--- a/order/src/test/java/com/baiyue/order/controller/OrderControllerPermissionTest.java
+++ b/order/src/test/java/com/baiyue/order/controller/OrderControllerPermissionTest.java
@@ -41,6 +41,8 @@ class OrderControllerPermissionTest {
             AuthenticatedUser.class, long.class, long.class, OrderRequests.SaveRequest.class);
         assertAuthority(PlatformFirstLegOrderController.class, "submit", "hasAuthority('platform:order:submit')",
             AuthenticatedUser.class, long.class, long.class, String.class);
+        assertAuthority(PlatformFirstLegOrderController.class, "assignCarrier", "hasAuthority('platform:order:approve')",
+            AuthenticatedUser.class, long.class, long.class, OrderRequests.CarrierRequest.class);
     }
 
     @Test
diff --git a/order/src/test/java/com/baiyue/order/dto/OrderRequestsValidationTest.java b/order/src/test/java/com/baiyue/order/dto/OrderRequestsValidationTest.java
new file mode 100644
index 000000000..308fee7fe
--- /dev/null
+++ b/order/src/test/java/com/baiyue/order/dto/OrderRequestsValidationTest.java
@@ -0,0 +1,41 @@
+package com.baiyue.order.dto;
+
+import jakarta.validation.Validation;
+import jakarta.validation.Validator;
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class OrderRequestsValidationTest {
+    private final Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
+
+    @Test
+    void carrierSnapshotIsOptionalWhenCustomerCreatesAnOrderDraft() {
+        assertThat(validator.validate(request(null, null))).isEmpty();
+    }
+
+    @Test
+    void carrierSnapshotMustBeBothPresentOrBothAbsent() {
+        assertThat(validator.validate(request(9L, null)))
+                .anyMatch(violation -> violation.getMessage().contains("必须同时填写或同时留空"));
+        assertThat(validator.validate(request(null, "船司")))
+                .anyMatch(violation -> violation.getMessage().contains("必须同时填写或同时留空"));
+        assertThat(validator.validate(request(9L, "船司"))).isEmpty();
+    }
+
+    private OrderRequests.SaveRequest request(Long carrierId, String carrierName) {
+        var cargo = new OrderRequests.Cargo(
+                "货物", null, "CARTON", 1, BigDecimal.ONE, BigDecimal.ONE,
+                null, null, null, null, null, false, null, null, null, null,
+                null, null, null, null, null, null, null, null, null);
+        var request = new OrderRequests.SaveRequest(
+                null, "当前企业", "SEA", "FOB", "US", 193000000000200003L, "洛杉矶仓",
+                null, null, null, null, List.of(cargo), "SELF_EXPRESS", 193000000000200001L,
+                "义乌仓", "SEA-US-GENERAL", "美线普货专线", carrierId, carrierName, "BUY_DECLARATION",
+                "FULL_CONTAINER", true, "OVERSEAS", null, null, "123456789");
+        return request;
+    }
+}
diff --git a/order/src/test/java/com/baiyue/order/service/OrderApplicationServiceStateTest.java b/order/src/test/java/com/baiyue/order/service/OrderApplicationServiceStateTest.java
index d04e34ebc..9a24965f5 100644
--- a/order/src/test/java/com/baiyue/order/service/OrderApplicationServiceStateTest.java
+++ b/order/src/test/java/com/baiyue/order/service/OrderApplicationServiceStateTest.java
@@ -101,6 +101,58 @@ class OrderApplicationServiceStateTest {
             && "UPDATE".equals(history.getAction())));
     }
 
+    @Test
+    void platformAssignsTrustedCarrierSnapshotToSubmittedOrder() {
+        OrderRepository repository = mock(OrderRepository.class);
+        OrderMasterDataGuard masterData = mock(OrderMasterDataGuard.class);
+        OrderEntity order = persistedOrder(OrderStatus.SUBMITTED);
+        when(repository.findOwned(10001L, 1L)).thenReturn(order);
+        when(repository.saveOrder(10001L, order)).thenReturn(1);
+        when(masterData.validateCarrier(9L)).thenReturn(
+            new PartnerClient.Partner(9L, 0L, "服务端船司名", "ACTIVE", "CARRIER", List.of("CARRIER")));
+
+        service(repository, mock(OrderEligibilityGuard.class), masterData)
+            .assignCarrier(10001L, 2L, 1L, new OrderRequests.CarrierRequest(9L));
+
+        assertThat(order.getCarrierId()).isEqualTo(9L);
+        assertThat(order.getCarrierName()).isEqualTo("服务端船司名");
+        verify(repository).saveOrder(10001L, order);
+    }
+
+    @Test
+    void approvalRequiresCarrierAssignment() {
+        OrderRepository repository = mock(OrderRepository.class);
+        OrderEntity order = persistedOrder(OrderStatus.SUBMITTED);
+        when(repository.findOwned(10001L, 1L)).thenReturn(order);
+
+        assertThatThrownBy(() -> service(repository, mock(OrderEligibilityGuard.class), mock(OrderMasterDataGuard.class))
+            .transit(10001L, 2L, "u", 1L, OrderStatus.APPROVED, null))
+            .isInstanceOf(BizException.class)
+            .hasMessageContaining("请先选择有效承运商");
+
+        verify(repository, never()).saveOrder(anyLong(), any());
+    }
+
+    @Test
+    void approvalRevalidatesCarrierAndRefreshesItsName() {
+        OrderRepository repository = mock(OrderRepository.class);
+        OrderMasterDataGuard masterData = mock(OrderMasterDataGuard.class);
+        OrderEntity order = persistedOrder(OrderStatus.SUBMITTED);
+        order.setCarrierId(9L);
+        order.setCarrierName("旧名称");
+        when(repository.findOwned(10001L, 1L)).thenReturn(order);
+        when(repository.saveOrder(10001L, order)).thenReturn(1);
+        when(masterData.validateCarrier(9L)).thenReturn(
+            new PartnerClient.Partner(9L, 0L, "最新船司名", "ACTIVE", "CARRIER", List.of("CARRIER")));
+
+        service(repository, mock(OrderEligibilityGuard.class), masterData)
+            .transit(10001L, 2L, "u", 1L, OrderStatus.APPROVED, null);
+
+        assertThat(order.getStatus()).isEqualTo(OrderStatus.APPROVED);
+        assertThat(order.getCarrierName()).isEqualTo("最新船司名");
+        verify(masterData).validateCarrier(9L);
+    }
+
     @Test
     void merchantDraftEditorStillCannotEditSubmittedOrder() {
         OrderRepository repository = mock(OrderRepository.class);
@@ -297,4 +349,12 @@ class OrderApplicationServiceStateTest {
         order.setDestinationType(destinationType);
         return order;
     }
+
+    private OrderEntity persistedOrder(OrderStatus status) {
+        OrderEntity order = new OrderEntity();
+        order.setId(1L);
+        order.setTenantId(10001L);
+        order.setStatus(status);
+        return order;
+    }
 }
diff --git a/order/src/test/java/com/baiyue/order/service/OrderMasterDataGuardTest.java b/order/src/test/java/com/baiyue/order/service/OrderMasterDataGuardTest.java
index 1bf86be13..48e0a44c4 100644
--- a/order/src/test/java/com/baiyue/order/service/OrderMasterDataGuardTest.java
+++ b/order/src/test/java/com/baiyue/order/service/OrderMasterDataGuardTest.java
@@ -45,6 +45,31 @@ class OrderMasterDataGuardTest {
         assertThat(result.receiving().warehouse().warehouseName()).isEqualTo("深圳仓");
     }
     @Test
+    void carrierValidationReturnsTrustedPublicCarrierSnapshot() {
+        var carrier = new PartnerClient.Partner(9L, PUBLIC_TENANT_ID, "服务端船司名", "ACTIVE", "CARRIER", List.of("SUPPLIER", "CARRIER"));
+        when(partners.active("token", PUBLIC_TENANT_ID, 9L)).thenReturn(ApiResponse.success(carrier));
+
+        assertThat(guard.validateCarrier(9L).partnerName()).isEqualTo("服务端船司名");
+    }
+    @Test
+    void carrierValidationSupportsLegacySingleTypeSnapshot() {
+        var carrier = new PartnerClient.Partner(9L, PUBLIC_TENANT_ID, "旧数据船司", "ACTIVE", "CARRIER", null);
+        when(partners.active("token", PUBLIC_TENANT_ID, 9L)).thenReturn(ApiResponse.success(carrier));
+
+        assertThat(guard.validateCarrier(9L).partnerName()).isEqualTo("旧数据船司");
+    }
+    @Test
+    void partnerWithoutCarrierTypeCannotBeAssignedToOrder() {
+        var supplier = new PartnerClient.Partner(9L, PUBLIC_TENANT_ID, "普通供应商", "ACTIVE", "SUPPLIER", List.of("SUPPLIER"));
+        when(partners.active("token", PUBLIC_TENANT_ID, 9L)).thenReturn(ApiResponse.success(supplier));
+
+        assertThatThrownBy(() -> guard.validateCarrier(9L))
+            .isInstanceOf(BizException.class)
+            .hasMessageContaining("不具备承运商类型")
+            .extracting(exception -> ((BizException) exception).getResultCode())
+            .isEqualTo(ResultCode.VALIDATION_FAILED);
+    }
+    @Test
     void inactiveOrCrossTenantMasterDataIsRejected() {
         when(partners.active("token",PUBLIC_TENANT_ID,7)).thenReturn(ApiResponse.success(null));
         assertThatThrownBy(() -> guard.validate(10002,request(7L,8L)))