diff --git a/pay/alipay.go b/pay/alipay.go
index f44b7d4..4cfcc17 100644
--- a/pay/alipay.go
+++ b/pay/alipay.go
@@ -425,7 +425,7 @@ func AlipayTradeRefund(args map[string]string) (*md.AlipayTradeRefund, error) {
 	//请求参数
 	bm := make(gopay.BodyMap)
 	bm.SetBodyMap("biz_content", func(bz gopay.BodyMap) {
-		bz.Set("out_trade_no", args["out_trade_no"])
+		bz.Set("trade_no", args["trade_no"])
 		bz.Set("refund_amount", args["refund_amount"])
 		bz.Set("refund_reason", args["refund_reason"])
 		bz.Set("out_request_no", args["out_request_no"])