diff --git a/hb_server/apps/sam/serializers.py b/hb_server/apps/sam/serializers.py
index eb3a840..e00b9cb 100644
--- a/hb_server/apps/sam/serializers.py
+++ b/hb_server/apps/sam/serializers.py
@@ -72,7 +72,7 @@ class SaleCreateSerializer(serializers.ModelSerializer):
                 attrs['customer'] = order.customer
             attrs['product'] = order.product
         for i in attrs['iproducts']:
-            if i.material is not attrs['product']:
+            if i.material !=  attrs['product']:
                 raise exceptions.APIException('产品选取错误')
         return super().validate(attrs)