diff --git a/apps/wpm/serializers.py b/apps/wpm/serializers.py
index 9165a88e..321e2cbb 100644
--- a/apps/wpm/serializers.py
+++ b/apps/wpm/serializers.py
@@ -167,6 +167,8 @@ class MlogbSerializer(CustomModelSerializer):
 
 
 class MlogSerializer(CustomModelSerializer):
+    belong_dept = serializers.CharField(
+        source='mtask.mgroup.belong_dept.id', read_only=True)
     mgroup_name = serializers.CharField(
         source='mtask.mgroup.name', read_only=True)
     mtask_count = serializers.IntegerField(