diff --git a/client/client.go b/client/client.go
index cb69dfd..1c79b87 100644
--- a/client/client.go
+++ b/client/client.go
@@ -25,8 +25,8 @@ type Client interface {
 	Close()
 
 	Notify(method string, args interface{}) error
-	Call(method string, args interface{}, result interface{}) error
-	CallTimeout(method string, args interface{}, result interface{}, timeout time.Duration) error
+	Call(method string, args interface{}) (result interface{}, err error)
+	CallTimeout(method string, args interface{}, timeout time.Duration) (result interface{}, err error)
 }
 
 type client struct {
@@ -78,11 +78,11 @@ func (c *client) Notify(method string, args interface{}) error {
 	return err
 }
 
-func (c *client) Call(method string, args interface{}, result interface{}) error {
-	return c.CallTimeout(method, args, result, c.ch.GetRequestTimeout())
+func (c *client) Call(method string, args interface{}) (result interface{}, err error) {
+	return c.CallTimeout(method, args, c.ch.GetRequestTimeout())
 }
 
-func (c *client) CallTimeout(method string, args interface{}, result interface{}, timeout time.Duration) (err error) {
+func (c *client) CallTimeout(method string, args interface{}, timeout time.Duration) (result interface{}, err error) {
 	var cs *CallState
 	if cs, err = c.send(method, args, result, true, true); nil != err {
 		return
@@ -101,7 +101,7 @@ func (c *client) CallTimeout(method string, args interface{}, result interface{}
 
 	releaseTimer(t)
 
-	return nil
+	return
 }
 
 func (c *client) send(method string, args interface{}, result interface{}, hasResponse bool, usePool bool) (cs *CallState, err error) {