diff --git a/nl-module-lms/nl-module-lms-server/src/main/java/cn/code/nl/module/lms/service/subpackagerelation/SubPackageRelationServiceImpl.java b/nl-module-lms/nl-module-lms-server/src/main/java/cn/code/nl/module/lms/service/subpackagerelation/SubPackageRelationServiceImpl.java
index ef3fdadb..2a3e98ac 100644
--- a/nl-module-lms/nl-module-lms-server/src/main/java/cn/code/nl/module/lms/service/subpackagerelation/SubPackageRelationServiceImpl.java
+++ b/nl-module-lms/nl-module-lms-server/src/main/java/cn/code/nl/module/lms/service/subpackagerelation/SubPackageRelationServiceImpl.java
@@ -34,6 +34,8 @@ public class SubPackageRelationServiceImpl implements SubPackageRelationService
 
     /** 必填字段缺失错误码 */
     private static final String REQUIRED_FIELD_MISSING = "REQUIRED_FIELD_MISSING";
+    /** 前端行标识重复错误码 */
+    private static final String DUPLICATE_CLIENT_KEY = "DUPLICATE_CLIENT_KEY";
     /** 木箱类型不存在错误码 */
     private static final String BOX_TYPE_NOT_FOUND = "BOX_TYPE_NOT_FOUND";
     /** 木箱容量超限错误码 */
@@ -60,6 +62,12 @@ public class SubPackageRelationServiceImpl implements SubPackageRelationService
     public SubPackageRelationBatchCreateRespVO batchCreateSubPackageRelation(SubPackageRelationBatchCreateReqVO reqVO) {
         List<SubPackageRelationBatchCreateRespVO.Failure> failures = new ArrayList<>();
         List<BatchItemContext> validItems = new ArrayList<>();
+        Map<String, Integer> clientKeyCounts = new HashMap<>();
+        for (SubPackageRelationBatchCreateItemReqVO item : reqVO.getItems()) {
+            if (item != null && StringUtils.hasText(item.getClientKey())) {
+                clientKeyCounts.merge(item.getClientKey(), 1, Integer::sum);
+            }
+        }
         for (int index = 0; index < reqVO.getItems().size(); index++) {
             SubPackageRelationBatchCreateItemReqVO item = reqVO.getItems().get(index);
             int rowIndex = index + 1;
@@ -94,6 +102,11 @@ public class SubPackageRelationServiceImpl implements SubPackageRelationService
                         "缺失字段：" + String.join("、", missingFields)));
                 continue;
             }
+            if (clientKeyCounts.get(item.getClientKey()) > 1) {
+                failures.add(buildFailure(item.getClientKey(), rowIndex, DUPLICATE_CLIENT_KEY,
+                        "前端行标识 clientKey 重复"));
+                continue;
+            }
             validItems.add(new BatchItemContext(item, rowIndex));
         }
         if (CollUtil.isEmpty(validItems)) {