diff --git a/runtime/datamate-python/app/module/annotation/interface/project.py b/runtime/datamate-python/app/module/annotation/interface/project.py
index 95eaa1f..4ad3779 100644
--- a/runtime/datamate-python/app/module/annotation/interface/project.py
+++ b/runtime/datamate-python/app/module/annotation/interface/project.py
@@ -406,10 +406,16 @@ async def update_mapping(
 
         service = DatasetMappingService(db)
 
-        # 使用 mapping UUID 查询映射记录
-        mapping = await service.get_mapping_by_uuid(project_id)
+        # 直接查询 ORM 模型获取原始数据
+        result = await db.execute(
+            select(LabelingProject).where(
+                LabelingProject.id == project_id,
+                LabelingProject.deleted_at.is_(None)
+            )
+        )
+        mapping_orm = result.scalar_one_or_none()
 
-        if not mapping:
+        if not mapping_orm:
             raise HTTPException(
                 status_code=404,
                 detail=f"Mapping not found: {project_id}"
@@ -422,8 +428,8 @@ async def update_mapping(
 
         # 从 configuration 字段中读取和更新 description 和 label_config
         configuration = {}
-        if mapping.configuration:
-            configuration = mapping.configuration.copy() if isinstance(mapping.configuration, dict) else {}
+        if mapping_orm.configuration:
+            configuration = mapping_orm.configuration.copy() if isinstance(mapping_orm.configuration, dict) else {}
 
         if request.description is not None:
             configuration["description"] = request.description
@@ -438,10 +444,11 @@ async def update_mapping(
 
         if not update_values:
             # 没有要更新的字段，直接返回当前数据
+            response_data = await service.get_mapping_by_uuid(project_id)
             return StandardResponse(
                 code=200,
                 message="success",
-                data=mapping
+                data=response_data
             )
 
         # 执行更新