diff --git a/hb_server/apps/wpm/serializers.py b/hb_server/apps/wpm/serializers.py
index 778e48e..9294ec4 100644
--- a/hb_server/apps/wpm/serializers.py
+++ b/hb_server/apps/wpm/serializers.py
@@ -93,7 +93,7 @@ class PickSerializer(serializers.Serializer):
                         raise exceptions.APIException('超过计划需求数')
                     if isLowLevel:
                         # 更新半成品表
-                        wids = iproducts.values_list('wproduct', flat=True)
+                        wids = IProduct.objects.filter(pk__in=[x.id for x in iproducts]).values_list('wproduct', flat=True)
                         wproducts = WProduct.objects.filter(pk__in=wids)
                         first_step = Step.objects.get(pk=sp.steps[0].id)
                         wproducts.update(step=first_step, is_executed=False,