diff --git a/rpc/client.go b/rpc/client.go
index 0a4b544..70025d1 100644
--- a/rpc/client.go
+++ b/rpc/client.go
@@ -142,8 +142,6 @@ func (c *Client) call(fn reflect.Value, name string, in []reflect.Value) []refle
 }
 
 func (c *Client) returnCallError(fn reflect.Value, err error) []reflect.Value {
-	println("return call error", err.Error())
-
 	nOut := fn.Type().NumOut()
 	out := make([]reflect.Value, nOut)
 	for i := 0; i < nOut-1; i++ {
diff --git a/rpc/rpc_test.go b/rpc/rpc_test.go
index 6a4f024..4390d70 100644
--- a/rpc/rpc_test.go
+++ b/rpc/rpc_test.go
@@ -33,31 +33,101 @@ func newTestClient() *Client {
 	return testClient
 }
 
-func OnlineRpc(id int) (int, string, error) {
-	return id * 10, "abc", errors.New("hello world")
+func test_Rpc1(id int) (int, string, error) {
+	return id * 10, "abc", nil
 }
 
-func TestRpc(t *testing.T) {
-	defer func() {
-		e := recover()
-		if s, ok := e.(string); ok {
-			println(s)
-		}
-
-		if err, ok := e.(error); ok {
-			println(err.Error())
-		}
-	}()
+func TestRpc1(t *testing.T) {
 	s := newTestServer()
 
-	s.Register("online_rpc", OnlineRpc)
+	s.Register("rpc1", test_Rpc1)
 
 	c := newTestClient()
 
 	var r func(int) (int, string, error)
-	if err := c.MakeRpc("online_rpc", &r); err != nil {
+	if err := c.MakeRpc("rpc1", &r); err != nil {
 		t.Fatal(err)
 	}
 
-	r(10)
+	a, b, e := r(10)
+	if e != nil {
+		t.Fatal(e)
+	}
+
+	if a != 100 || b != "abc" {
+		t.Fatal(a, b)
+	}
+}
+
+func test_Rpc2(ids []int) ([]int, error) {
+	if ids == nil || len(ids) == 0 {
+		return nil, errors.New("nid ids")
+	}
+
+	if len(ids) >= 2 {
+		return []int{}, nil
+	}
+
+	return []int{ids[0] * 10}, nil
+}
+
+func TestRpc2(t *testing.T) {
+	s := newTestServer()
+
+	s.Register("rpc2", test_Rpc2)
+
+	c := newTestClient()
+
+	var r func(ids []int) ([]int, error)
+	c.MakeRpc("rpc2", &r)
+
+	a, e := r(nil)
+	if e == nil {
+		t.Fatal("must error")
+	}
+
+	a, e = r([]int{})
+	if e == nil {
+		t.Fatal("must error")
+	}
+
+	a, e = r([]int{1})
+	if e != nil {
+		t.Fatal(e)
+	} else if a[0] != 10 {
+		t.Fatal(a[0])
+	}
+
+	a, e = r([]int{1, 2, 3})
+	if e != nil {
+		t.Fatal(e)
+	} else if len(a) != 0 {
+		t.Fatal("must 0")
+	}
+}
+
+func test_Rpc3(id int) error {
+	return errors.New("hello world")
+}
+
+func TestRpc3(t *testing.T) {
+	s := newTestServer()
+
+	s.Register("rpc3", test_Rpc3)
+
+	c := newTestClient()
+
+	var r func(int) error
+	if err := c.MakeRpc("rpc3", &r); err != nil {
+		t.Fatal(err)
+	}
+
+	e := r(10)
+	if e != nil {
+		if e.Error() != "hello world" {
+			t.Fatal(e.Error())
+		}
+	} else {
+		t.Fatal("must error")
+	}
 }
diff --git a/rpc/server.go b/rpc/server.go
index 7893760..de070f1 100644
--- a/rpc/server.go
+++ b/rpc/server.go
@@ -96,7 +96,6 @@ func (s *Server) Register(name string, f interface{}) (err error) {
 }
 
 func (s *Server) onConn(co net.Conn) {
-	println("onconn")
 	c := new(conn)
 	c.co = co