diff --git a/extend/ca_v2/client.go b/extend/ca_v2/client.go
index d25e70c..6d22ac9 100644
--- a/extend/ca_v2/client.go
+++ b/extend/ca_v2/client.go
@@ -78,7 +78,10 @@ func (c *Client) postForm(path string, form url.Values, out interface{}) error {
 
 	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 	req.Header.Set("app_id", c.AppID)
-	req.Header.Set("signature", c.signature(form))
+	signature := c.signature(form)
+	req.Header.Set("signature", signature)
+
+	c.logUpstreamRequest(path, form, signature)
 
 	resp, err := c.HTTPClient.Do(req)
 	if err != nil {
@@ -182,6 +185,20 @@ func setValue(form url.Values, key, value string) {
 	form.Set(key, value)
 }
 
+func (c *Client) logUpstreamRequest(path string, form url.Values, signature string) {
+	if global.Logger == nil {
+		return
+	}
+
+	global.Logger.WithFields(logrus.Fields{
+		"module":         "ca_v2",
+		"upstream_path":  path,
+		"request_form":   form.Encode(),
+		"request_params": form,
+		"signature":      signature,
+	}).Info("ca v2 upstream request")
+}
+
 func (c *Client) logUpstreamResponse(path string, form url.Values, statusCode int, body string) {
 	if global.Logger == nil {
 		return