diff --git a/hb_server/apps/mtm/views.py b/hb_server/apps/mtm/views.py
index c21c08f..d218d7b 100644
--- a/hb_server/apps/mtm/views.py
+++ b/hb_server/apps/mtm/views.py
@@ -62,7 +62,7 @@ class ProcessViewSet(PageOrNot, CreateUpdateModelAMixin, ModelViewSet):
         serializer = self.serializer_class(instance=Step.objects.filter(process=process, is_deleted=False), many=True)
         return Response(serializer.data)
 
-class StepViewSet(CreateUpdateModelAMixin, CreateModelMixin, UpdateModelMixin, RetrieveModelMixin, DestroyModelMixin, GenericViewSet):
+class StepViewSet(OptimizationMixin, CreateUpdateModelAMixin, CreateModelMixin, UpdateModelMixin, RetrieveModelMixin, DestroyModelMixin, GenericViewSet):
     """
     子工序-增删改查
     """
@@ -74,9 +74,7 @@ class StepViewSet(CreateUpdateModelAMixin, CreateModelMixin, UpdateModelMixin, R
     ordering = ['sort']
 
     def get_serializer_class(self):
-        if self.action == 'retrieve':
-            return StepDetailSerializer
-        return StepSerializer
+        return StepDetailSerializer
 
 # class ProductProcessViewSet(PageOrNot, CreateModelMixin, UpdateModelMixin, ListModelMixin, DestroyModelMixin, GenericViewSet):
 #     """