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 a31b3d0d9..c3e71b849 100644
--- a/order/src/main/java/com/baiyue/order/service/OrderApplicationService.java
+++ b/order/src/main/java/com/baiyue/order/service/OrderApplicationService.java
@@ -401,6 +401,7 @@ public class OrderApplicationService {
                     "提交订单前必须完善货物品名、包装类型、箱数、毛重和体积");
             }
             validatePersistedCargoQuantity(cargo, cargoIndex, true);
+            requireDropshipSku(order.getFulfillmentType(), cargo.getSkuNo(), cargoIndex);
             if (Boolean.TRUE.equals(cargo.getWoodenProduct()) && !Boolean.TRUE.equals(order.getCustomsInspection())) {
                 throw new BizException(ResultCode.VALIDATION_FAILED, "木制品必须选择商检");
             }
@@ -441,7 +442,8 @@ public class OrderApplicationService {
         }
         validateWoodInspection(request);
         validateRequestCargoQuantities(request.cargoes(), true);
-        for (var cargo : request.cargoes()) {
+        for (int cargoIndex = 0; cargoIndex < request.cargoes().size(); cargoIndex++) {
+            var cargo = request.cargoes().get(cargoIndex);
             if (!StringUtils.hasText(cargo.cargoName()) || !StringUtils.hasText(cargo.packageType())
                     || cargo.packageCount() < 1 || cargo.grossWeightKg() == null
                     || cargo.grossWeightKg().signum() <= 0 || cargo.volumeCbm() == null
@@ -449,6 +451,7 @@ public class OrderApplicationService {
                 throw new BizException(ResultCode.VALIDATION_FAILED,
                     "提交订单前必须完善货物品名、包装类型、箱数、毛重和体积");
             }
+            requireDropshipSku(request.fulfillmentType(), cargo.skuNo(), cargoIndex);
         }
         validateMixedCartons(request);
         if ("FBA".equals(request.destinationType())) {
@@ -467,6 +470,13 @@ public class OrderApplicationService {
         }
     }
 
+    private static void requireDropshipSku(String fulfillmentType, String skuNo, int cargoIndex) {
+        if ("ONE_CLICK_DROPSHIP".equals(fulfillmentType) && !StringUtils.hasText(skuNo)) {
+            throw new BizException(ResultCode.VALIDATION_FAILED,
+                "第 " + (cargoIndex + 1) + " 条一件代发货物必须填写 SKU NO.");
+        }
+    }
+
     private void validateRequestCargoQuantities(List<OrderRequests.Cargo> cargoes, boolean required) {
         for (int index = 0; index < cargoes.size(); index++) {
             OrderRequests.Cargo cargo = cargoes.get(index);
diff --git a/order/src/main/resources/openapi/order-v1.yaml b/order/src/main/resources/openapi/order-v1.yaml
index c31a53cb7..c1ea54b99 100644
--- a/order/src/main/resources/openapi/order-v1.yaml
+++ b/order/src/main/resources/openapi/order-v1.yaml
@@ -1399,7 +1399,7 @@ components:
       type: object
       required: [packageCount, woodenProduct]
       properties:
-        skuNo: {type: string, maxLength: 64}
+        skuNo: {type: string, maxLength: 64, description: 草稿可空；FBA 或 ONE_CLICK_DROPSHIP 订单提交及已提交编辑时每条货物必填}
         cargoName: {type: string, maxLength: 128}
         cargoNameEn: {type: string, maxLength: 128}
         productImageFileId: {type: string, pattern: '^[1-9][0-9]*$'}
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 00f440b1f..1417e4afc 100644
--- a/order/src/test/java/com/baiyue/order/service/OrderApplicationServiceStateTest.java
+++ b/order/src/test/java/com/baiyue/order/service/OrderApplicationServiceStateTest.java
@@ -375,6 +375,72 @@ class OrderApplicationServiceStateTest {
         verify(repository).saveOrder(20002L, order);
     }
 
+    @Test
+    void submittingDropshipDraftRequiresEachPersistedSkuBeforeAnyStateWriteForBothTaxModes() {
+        for (String taxMode : List.of("BUY_DECLARATION", "TAX_REFUND")) {
+            for (String sku : java.util.Arrays.asList(null, "", "  ")) {
+                OrderRepository repository = mock(OrderRepository.class);
+                OrderEntity order = persistedDraft("SELF_EXPRESS", "OVERSEAS");
+                order.setFulfillmentType("ONE_CLICK_DROPSHIP"); order.setTaxMode(taxMode);
+                OrderCargoEntity valid = completeCargo(); valid.setSkuNo("SKU-VALID");
+                OrderCargoEntity missing = completeCargo(); missing.setSkuNo(sku);
+                when(repository.findOwned(20002L, 1L)).thenReturn(order);
+                when(repository.findCargo(20002L, 1L)).thenReturn(List.of(valid, missing));
+
+                assertThatThrownBy(() -> service(repository, mock(OrderEligibilityGuard.class), mock(OrderMasterDataGuard.class))
+                    .submit(20002L, 2L, "u", 1L, "missing-sku"))
+                    .isInstanceOf(BizException.class).hasMessage("第 2 条一件代发货物必须填写 SKU NO.")
+                    .extracting(exception -> ((BizException) exception).getResultCode()).isEqualTo(ResultCode.VALIDATION_FAILED);
+                assertThat(order.getStatus()).isEqualTo(OrderStatus.DRAFT);
+                assertThat(order.getSubmittedAt()).isNull(); assertThat(order.getInboundCode()).isNull();
+                verify(repository, never()).saveOrder(anyLong(), any());
+                verify(repository, never()).insertOutbox(any());
+                verify(repository, never()).insertHistory(any());
+                verify(repository, never()).completeIdempotency(anyLong(), any(), anyLong());
+            }
+        }
+    }
+
+    @Test
+    void submittingDropshipDraftWithSkuKeepsUpcOptional() {
+        OrderRepository repository = mock(OrderRepository.class);
+        OrderEntity order = persistedDraft("SELF_EXPRESS", "OVERSEAS");
+        order.setFulfillmentType("ONE_CLICK_DROPSHIP");
+        OrderCargoEntity cargo = completeCargo(); cargo.setSkuNo("SKU-VALID"); cargo.setUpcNo(null);
+        when(repository.findOwned(20002L, 1L)).thenReturn(order);
+        when(repository.findCargo(20002L, 1L)).thenReturn(List.of(cargo));
+        when(repository.findParties(20002L, 1L)).thenReturn(List.of());
+        when(repository.saveOrder(20002L, order)).thenReturn(1);
+        service(repository, mock(OrderEligibilityGuard.class), mock(OrderMasterDataGuard.class))
+            .transit(20002L, 2L, "u", 1L, OrderStatus.SUBMITTED, null);
+        assertThat(order.getStatus()).isEqualTo(OrderStatus.SUBMITTED);
+        verify(repository).saveOrder(20002L, order);
+    }
+
+    @Test
+    void submittedDropshipEditorCannotRemoveRequiredSku() {
+        OrderRepository repository = mock(OrderRepository.class);
+        OrderEntity order = persistedOrder(OrderStatus.SUBMITTED);
+        when(repository.findOwned(10001L, 1L)).thenReturn(order);
+        OrderRequests.SaveRequest source = request();
+        OrderRequests.SaveRequest missingSku = new OrderRequests.SaveRequest(
+            source.customerId(), source.customerName(), source.transportMode(), source.tradeTerm(),
+            source.destinationCountryCode(), source.destinationWarehouseId(), source.destinationWarehouseName(),
+            source.expectedShipDate(), source.customerRemark(), source.sender(), source.receiver(), source.cargoes(),
+            source.pickupMethod(), source.requestedPickupAt(), source.receivingWarehouseId(),
+            source.receivingWarehouseName(), source.channelCode(), source.channelName(), source.carrierId(),
+            source.carrierName(), source.taxMode(), source.pricingTaxMode(), source.containerMode(),
+            source.customsInspection(), source.destinationType(), source.amazonWarehouseCode(), source.shipmentId(),
+            source.referenceId(), source.inboundCode(), "ONE_CLICK_DROPSHIP");
+        assertThatThrownBy(() -> service(repository, mock(OrderEligibilityGuard.class), mock(OrderMasterDataGuard.class))
+            .updateSubmittedOrder(10001L, 2L, 1L, missingSku))
+            .isInstanceOf(BizException.class).hasMessage("第 1 条一件代发货物必须填写 SKU NO.")
+            .extracting(exception -> ((BizException) exception).getResultCode()).isEqualTo(ResultCode.VALIDATION_FAILED);
+        verify(repository, never()).saveOrder(anyLong(), any());
+        verify(repository, never()).replaceDraftChildren(anyLong(), anyLong());
+        verify(repository, never()).insertHistory(any());
+    }
+
     @Test
     void submittingDraftPreparesInboundForWarehouseMeasurementBeforeReview() {
         OrderRepository repository = mock(OrderRepository.class);