diff --git a/apps/opm/views.py b/apps/opm/views.py
index f438b8e9..c2c0a73e 100644
--- a/apps/opm/views.py
+++ b/apps/opm/views.py
@@ -123,6 +123,8 @@ class OplViewSet(CustomModelViewSet):
         if obj.mtask_uid:
             close_mtask(obj.mtask_uid)
             # 防止没变化，手动处理一下
+        obj.mtask_uid = None
+        obj.save()
         return Response()