diff --git a/partnerapi/jtexpress/const.go b/partnerapi/jtexpress/const.go
index 6a7e3e0..641bf78 100644
--- a/partnerapi/jtexpress/const.go
+++ b/partnerapi/jtexpress/const.go
@@ -17,4 +17,5 @@ const (
 const (
 	msgTypeEstimateFee = "FREIGHTQUERY"
 	msgTypeCreateOrder = "ORDERCREATE"
+	msgTypeCancelOrder = "UPDATE"
 )
diff --git a/partnerapi/jtexpress/jtexpress.go b/partnerapi/jtexpress/jtexpress.go
index 34457c2..9823981 100644
--- a/partnerapi/jtexpress/jtexpress.go
+++ b/partnerapi/jtexpress/jtexpress.go
@@ -66,7 +66,7 @@ func (c *Client) CancelOrder(req *CancelOrderReq) (r Response) {
 	body := map[string]string{
 		"logistics_interface": data,
 		"data_digest":         c.getDigest(data),
-		"msg_type":            msgTypeEstimateFee,
+		"msg_type":            msgTypeCancelOrder,
 		"eccompanyid":         c.EccompanyID,
 	}
 	r.Request.Body = pjson.ToBytes(body)