diff --git a/services/plan_service.py b/services/plan_service.py
index bab0c89962089d646045091a74e7bdf3302f74bd..97f85c5efe8138fab2d78b17699bc5e1f180495d 100644
--- a/services/plan_service.py
+++ b/services/plan_service.py
@@ -178,7 +178,7 @@ async def run_task(plan_id, user, config):
     auto_task = await Task.query_obj_all(Task.id.in_(task_ids), Task.run_method == Task_Run_Method.AUTO)
     if config:
         for task in auto_task:
-            task.config += config
+            task.config = config
             task.gmt_modified = datetime.now()
             await task.update()
     await __start_auto_task(auto_task)