diff --git a/partnerapi/jtexpress/jtexpress.go b/partnerapi/jtexpress/jtexpress.go
index 4ff00f2..34457c2 100644
--- a/partnerapi/jtexpress/jtexpress.go
+++ b/partnerapi/jtexpress/jtexpress.go
@@ -48,7 +48,7 @@ func (c *Client) EstimateFee(req *EstimateFeeReq) (r Response) {
 	r.Request.Body = pjson.ToBytes(body)
 	r.Request.URL = path
 	resp, err := c.httpClient.R().
-		SetFormData(body).
+		SetMultipartFormData(body).
 		Post(path)
 	if err != nil {
 		r.Error = fmt.Errorf("jtepxress: request %s, err %v", path, err)
@@ -72,7 +72,7 @@ func (c *Client) CancelOrder(req *CancelOrderReq) (r Response) {
 	r.Request.Body = pjson.ToBytes(body)
 	r.Request.URL = path
 	resp, err := c.httpClient.R().
-		SetFormData(body).
+		SetMultipartFormData(body).
 		Post(path)
 	if err != nil {
 		r.Error = fmt.Errorf("jtepxress: request %s, err %v", path, err)
@@ -98,7 +98,7 @@ func (c *Client) CreateOrder(req *CreateOrderReq) (r Response) {
 	r.Request.URL = path
 
 	resp, err := c.httpClient.R().
-		SetFormData(body).
+		SetMultipartFormData(body).
 		Post(path)
 	if err != nil {
 		r.Error = fmt.Errorf("jtepxress: request %s, err %v", path, err)