diff --git a/unify/pay.go b/unify/pay.go
index 4a126f4..2ab8219 100644
--- a/unify/pay.go
+++ b/unify/pay.go
@@ -151,12 +151,12 @@ func (p *Pay) GetPartnerOrder(outTradeNo string) (map[string]interface{}, error)
 	return rsp.Data, nil
 }
 
-func (p *Pay) RefundOrder(outTradeNo, reason string) error {
-	if outTradeNo == "" {
+func (p *Pay) RefundOrder(req *RefundPartnerOrderReq) error {
+	if req.OutTradeNo == "" {
 		errors.New("outTradeNo is nil")
 	}
 
-	reqUrl := fmt.Sprintf("%s/api/pay/order?outTradeNo=%s&reason=%s", p.address, outTradeNo, reason)
+	reqUrl := fmt.Sprintf("%s/api/pay/order?outTradeNo=%s&reason=%s&refundFee=%d", p.address, req.OutTradeNo, req.Reason, req.RefundFee)
 	result, err := util.HttpDelete(reqUrl, map[string]string{
 		"x-token": p.token,
 	})
diff --git a/unify/pay_type.go b/unify/pay_type.go
index 1b8905e..a19af6d 100644
--- a/unify/pay_type.go
+++ b/unify/pay_type.go
@@ -44,6 +44,12 @@ type CreatePartnerOrderReq struct {
 	Extra      interface{} `json:"extra"`
 }
 
+type RefundPartnerOrderReq struct {
+	OutTradeNo string `json:"outTradeNo"`
+	Reason     string `json:"reason,omitempty"`
+	RefundFee  int64  `json:"refundFee,omitempty"`
+}
+
 type CommonResponse struct {
 	Code    int                    `json:"code"`
 	Message string                 `json:"message"`