diff --git a/modules/items/api_useItem.go b/modules/items/api_useItem.go
index 51e8401ae..e86913f06 100644
--- a/modules/items/api_useItem.go
+++ b/modules/items/api_useItem.go
@@ -130,7 +130,7 @@ func (this *apiComp) Useitem(session comm.IUserSession, req *pb.ItemsUseItemReq)
 		if code = this.module.AddItemforGrid(&comm.ModuleCallSource{}, session, req.GridId, -1*itemcf.SynthetizeNum*int32(req.Amount), true); code != pb.ErrorCode_Success {
 			return
 		}
-		sale := make([]*cfg.Game_atn, len(prop))
+		sale := make([]*cfg.Game_atn, 0, len(prop))
 		for _, v := range prop {
 			for _, v1 := range v.Prize {
 				sale = append(sale, &cfg.Game_atn{