diff --git a/User/views.py b/User/views.py
index 0eb2541..4bf6ee2 100644
--- a/User/views.py
+++ b/User/views.py
@@ -1549,20 +1549,21 @@ class roxyExhibition(APIView):
                     itme["project_conflicts"] = []
                     itme["bid_conflicts"] = []
             
-            # 案件变更、结案申请：返回上传文件 URL 列表，统一用 attachment_urls，供审批人在审核页查看
+            # 案件变更、结案申请：返回上传文件 URL，统一用 attachment_urls（字符串，无文件时为空字符串）
             if info.type == "案件变更":
                 try:
                     change_request = CaseChangeRequest.objects.filter(id=int(info.user_id), is_deleted=False).first()
                     if change_request and change_request.change_agreement:
                         try:
                             agreement_list = json.loads(change_request.change_agreement)
-                            itme["attachment_urls"] = agreement_list if isinstance(agreement_list, list) else []
+                            lst = agreement_list if isinstance(agreement_list, list) else []
+                            itme["attachment_urls"] = json.dumps(lst, ensure_ascii=False) if lst else ""
                         except (json.JSONDecodeError, TypeError):
-                            itme["attachment_urls"] = []
+                            itme["attachment_urls"] = ""
                     else:
-                        itme["attachment_urls"] = []
+                        itme["attachment_urls"] = ""
                 except (ValueError, TypeError):
-                    itme["attachment_urls"] = []
+                    itme["attachment_urls"] = ""
             elif info.type == "结案申请":
                 try:
                     schedule = Schedule.objects.filter(id=int(info.user_id), is_deleted=False).first()
@@ -1570,13 +1571,14 @@ class roxyExhibition(APIView):
                         try:
                             remark_data = json.loads(schedule.remark)
                             closing_files = remark_data.get("closing_application_files", [])
-                            itme["attachment_urls"] = closing_files if isinstance(closing_files, list) else []
+                            lst = closing_files if isinstance(closing_files, list) else []
+                            itme["attachment_urls"] = json.dumps(lst, ensure_ascii=False) if lst else ""
                         except (json.JSONDecodeError, TypeError):
-                            itme["attachment_urls"] = []
+                            itme["attachment_urls"] = ""
                     else:
-                        itme["attachment_urls"] = []
+                        itme["attachment_urls"] = ""
                 except (ValueError, TypeError):
-                    itme["attachment_urls"] = []
+                    itme["attachment_urls"] = ""
             
             data.append(itme)
         return Response({'message': '展示成功', "total": total, 'data': data, 'code': 0}, status=status.HTTP_200_OK)