diff --git a/hb_server/apps/wpm/serializers.py b/hb_server/apps/wpm/serializers.py
index 9294ec4..fc6be42 100644
--- a/hb_server/apps/wpm/serializers.py
+++ b/hb_server/apps/wpm/serializers.py
@@ -95,7 +95,7 @@ class PickSerializer(serializers.Serializer):
                         # 更新半成品表
                         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)
+                        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,
                         subproduction_plan=sp, production_plan=sp.production_plan)