diff --git a/iam/src/main/java/com/baiyue/iam/dto/OnboardingDtos.java b/iam/src/main/java/com/baiyue/iam/dto/OnboardingDtos.java
index 3b3d5fdb8..8fd172624 100644
--- a/iam/src/main/java/com/baiyue/iam/dto/OnboardingDtos.java
+++ b/iam/src/main/java/com/baiyue/iam/dto/OnboardingDtos.java
@@ -58,7 +58,7 @@ public final class OnboardingDtos {
             @NotNull Long tenantId,
             @NotBlank @Pattern(regexp = "[0-9A-Za-z]{18}") String unifiedSocialCreditCode,
             @NotBlank String businessLicenseDocumentUrl,
-            @NotBlank @Size(max = 255) String businessLicenseOriginalFileName,
+            @Size(max = 255) String businessLicenseOriginalFileName,
             LocalDate businessLicenseValidTo,
             boolean replaceBusinessLicense,
             String legalPersonIdDocumentUrl,
diff --git a/iam/src/main/java/com/baiyue/iam/service/ProfileResourceService.java b/iam/src/main/java/com/baiyue/iam/service/ProfileResourceService.java
index 68f11852d..e3b07d0fa 100644
--- a/iam/src/main/java/com/baiyue/iam/service/ProfileResourceService.java
+++ b/iam/src/main/java/com/baiyue/iam/service/ProfileResourceService.java
@@ -212,14 +212,16 @@ public class ProfileResourceService {
         String replacedBusinessLicenseUrl = supersede(businessLicenses, replacementComment);
         String replacedLegalPersonIdUrl = hasLegalPersonId ? supersede(legalPersonIds, replacementComment) : null;
         IamTenantQualification businessLicense = createQualification(tenant.getId(), "BUSINESS_LICENSE",
-                creditCode, request.businessLicenseDocumentUrl(), request.businessLicenseOriginalFileName());
+                creditCode, request.businessLicenseDocumentUrl(),
+                normalizeOriginalFileName(request.businessLicenseOriginalFileName(), request.businessLicenseDocumentUrl(), platformManaged));
         businessLicense.setValidTo(request.businessLicenseValidTo());
         if (platformManaged) markPlatformQualificationApproved(tenant, businessLicense);
         repository.saveQualification(businessLicense);
         IamTenantQualification legalPersonId = null;
         if (hasLegalPersonId) {
             legalPersonId = createQualification(tenant.getId(), "LEGAL_PERSON_ID",
-                    null, request.legalPersonIdDocumentUrl().trim(), request.legalPersonIdOriginalFileName());
+                    null, request.legalPersonIdDocumentUrl().trim(),
+                    normalizeOriginalFileName(request.legalPersonIdOriginalFileName(), request.legalPersonIdDocumentUrl(), platformManaged));
             legalPersonId.setValidTo(request.legalPersonIdValidTo());
             if (platformManaged) markPlatformQualificationApproved(tenant, legalPersonId);
             repository.saveQualification(legalPersonId);
@@ -297,7 +299,15 @@ public class ProfileResourceService {
     }
 
     private String normalizeOriginalFileName(String originalFileName) {
+        return normalizeOriginalFileName(originalFileName, null, false);
+    }
+
+    private String normalizeOriginalFileName(String originalFileName, String documentUrl, boolean platformManaged) {
         if (!StringUtils.hasText(originalFileName)) {
+            if (platformManaged && StringUtils.hasText(documentUrl)) {
+                String value = documentUrl.substring(documentUrl.lastIndexOf('/') + 1).trim();
+                if (StringUtils.hasText(value) && value.length() <= 255) return value;
+            }
             throw new BizException(ResultCode.BAD_REQUEST, "Original file name is required / 必须提供上传时原始文件名");
         }
         String normalized = originalFileName.trim();