diff --git a/apps/inm/views.py b/apps/inm/views.py
index 89c96a3c..9705b52d 100644
--- a/apps/inm/views.py
+++ b/apps/inm/views.py
@@ -122,6 +122,7 @@ class MIOViewSet(CustomModelViewSet):
     queryset = MIO.objects.all()
     select_related_fields = ['create_by', 'belong_dept', 'do_user',
                              'submit_user', 'supplier', 'order', 'customer', 'pu_order']
+    prefetch_related_fields = ['materials']
     serializer_class = MIOListSerializer
     retrieve_serializer_class = MIODetailSerializer
     filterset_class = MioFilter