diff --git a/apps/qm/serializers.py b/apps/qm/serializers.py
index b037cd28..bc06ea14 100644
--- a/apps/qm/serializers.py
+++ b/apps/qm/serializers.py
@@ -31,8 +31,10 @@ class QuaStatSfLogSerializer(CustomModelSerializer):
     class Meta:
         model = QuaStat
         fields = '__all__'
-        read_only_fields = EXCLUDE_FIELDS + ['type', 'year', 'month', 'day']
+        read_only_fields = EXCLUDE_FIELDS + ['type', 'year', 'month', 'day', 'belong_dept']
     
     def validate(self, attrs):
+        sflog = attrs['sflog']
         attrs['type'] = 'sflog'
+        attrs['belong_dept'] = sflog.mgroup.belong_dept
         return attrs
\ No newline at end of file