diff --git a/hb_server/apps/wpm/serializers.py b/hb_server/apps/wpm/serializers.py
index a0c479e..040de52 100644
--- a/hb_server/apps/wpm/serializers.py
+++ b/hb_server/apps/wpm/serializers.py
@@ -93,7 +93,8 @@ class PickSerializer(serializers.Serializer):
                         raise exceptions.APIException('超过计划需求数')
                     if isLowLevel:
                         # 更新半成品表
-                        wproducts = WProduct.objects.filter(pk__in=[x.wproduct for x in iproducts])
+                        wids = IProduct.objects.filter(pk__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, 
                         act_state=WProduct.WPR_ACT_STATE_DOING, is_hidden=False, warehouse=None,