diff --git a/platformapi/wxpayapi/wxpayapi.go b/platformapi/wxpayapi/wxpayapi.go
index 7637aae4..1ac43113 100644
--- a/platformapi/wxpayapi/wxpayapi.go
+++ b/platformapi/wxpayapi/wxpayapi.go
@@ -175,6 +175,7 @@ type CreateOrderParam struct {
 	TradeType      string `json:"trade_type" xml:"trade_type"`
 	TotalFee       int    `json:"total_fee" xml:"total_fee"`
 
+	SubMchID      string `json:"subMchID" xml:"sub_mch_id,omitempty"`
 	Detail        CData  `json:"detail.omitempty" xml:"detail,omitempty"`
 	Attach        string `json:"attach,omitempty" xml:"attach,omitempty"`
 	FeeType       string `json:"fee_type,omitempty" xml:"fee_type,omitempty"`