diff --git a/modules/items/modelitems.go b/modules/items/modelitems.go
index 604ed5c91..c522c4d02 100644
--- a/modules/items/modelitems.go
+++ b/modules/items/modelitems.go
@@ -125,7 +125,7 @@ func (this *ModelItemsComp) AddItemToUserPack(uId string, itemId int32, addnum i
 		this.module.Errorf("err:%v", err)
 		return
 	}
-	change = make([]*pb.DB_UserItemData, len(itmes))
+	change = make([]*pb.DB_UserItemData, 0)
 	add, update, del, leftnum = this.addItemToUserPack(uId, itmes, itemId, addnum)
 	if leftnum < 0 {
 		err = ItemNotEnoughError