diff --git a/apps/enp/serializers.py b/apps/enp/serializers.py
index e1359156..496923f5 100644
--- a/apps/enp/serializers.py
+++ b/apps/enp/serializers.py
@@ -24,6 +24,7 @@ class DrainSerializer(CustomModelSerializer):
 
 class Drain2Serializer(CustomModelSerializer):
     equip_data = serializers.SerializerMethodField()
+    mgroup_name = serializers.CharField(source='mgroup.name', read_only=True)
 
     class Meta:
         model = Drain
diff --git a/apps/enp/views.py b/apps/enp/views.py
index c8cdb3b7..eed9f4f9 100644
--- a/apps/enp/views.py
+++ b/apps/enp/views.py
@@ -21,6 +21,7 @@ class DrainViewSet(CustomModelViewSet):
     queryset = Drain.objects.all()
     serializer_class = DrainSerializer
     filterset_fields = ['type', 'cate', 'mgroup']
+    select_related_fields = ['mgroup']
 
     def get_serializer_class(self):
         has_equipdata = self.request.query_params.get('has_equipdata', 'no')