diff --git a/v2/json2/json_test.go b/v2/json2/json_test.go
index 23a19a8..a8e4444 100644
--- a/v2/json2/json_test.go
+++ b/v2/json2/json_test.go
@@ -152,6 +152,23 @@ func executeInvalidJSON(t *testing.T, s *rpc.Server, res interface{}) error {
 	return DecodeClientResponse(w.Body, res)
 }
 
+func TestNewService(t *testing.T) {
+	s := rpc.NewServer()
+	s.RegisterCodec(NewCodec(), "application/json")
+	if err := s.RegisterService(new(Service1), "Service1.service2.service3"); err != nil {
+		t.Fatal(err)
+	}
+
+	var res Service1Response
+	if err := execute(t, s, "Service1.service2.service3.Multiply",
+		&Service1Request{4, 2}, &res); err != nil {
+		t.Error("Expected err to be nil, but got:", err)
+	}
+
+	println("result:", res.Result)
+
+}
+
 func TestService(t *testing.T) {
 	s := rpc.NewServer()
 	s.RegisterCodec(NewCodec(), "application/json")
diff --git a/v2/map.go b/v2/map.go
index dda4216..b5cda62 100644
--- a/v2/map.go
+++ b/v2/map.go
@@ -30,6 +30,7 @@ type service struct {
 	rcvr     reflect.Value             // receiver of methods for the service
 	rcvrType reflect.Type              // type of the receiver
 	methods  map[string]*serviceMethod // registered methods
+	services map[string]*service       // 保存下一级的其他服务
 }
 
 type serviceMethod struct {
@@ -48,15 +49,67 @@ type serviceMap struct {
 	services map[string]*service
 }
 
+// 注册多个服务名的服务，每个服务名增加一个服务
+func (m *serviceMap) registryService(name string) (*service, error) {
+	// 切分服务全名
+	parts := strings.Split(name, ".")
+
+	var lastService *service
+	var newService *service
+	var serviceName string
+
+	// 遍历服务名
+	for _, part := range parts {
+		// 构建一个新的服务
+		newService = &service{
+			name:     part,
+			methods:  make(map[string]*serviceMethod),
+			services: make(map[string]*service),
+		}
+
+		// 服务名字
+		serviceName += part + "."
+		println(serviceName)
+		// 如果一开始是第一个服务名，要放到ServiceMap中
+		if lastService == nil {
+			lastService = newService
+
+			m.mutex.Lock()
+
+			if m.services == nil {
+				m.services = make(map[string]*service)
+			} else if _, ok := m.services[lastService.name]; ok {
+				return nil, fmt.Errorf("rpc: service already defined: %q",
+					serviceName)
+			}
+			m.services[lastService.name] = lastService
+
+			m.mutex.Unlock()
+		} else {
+
+			if _, ok := lastService.services[newService.name]; ok {
+				return nil, fmt.Errorf("rpc: service already defined: %q",
+					serviceName)
+			}
+
+			lastService.services[newService.name] = newService
+			lastService = newService
+		}
+	}
+
+	return newService, nil
+}
+
 // register adds a new service using reflection to extract its methods.
 func (m *serviceMap) register(rcvr interface{}, name string) error {
 	// Setup service.
-	s := &service{
-		name:     name,
-		rcvr:     reflect.ValueOf(rcvr),
-		rcvrType: reflect.TypeOf(rcvr),
-		methods:  make(map[string]*serviceMethod),
+	s, err := m.registryService(name)
+	if err != nil {
+		return err
 	}
+	s.rcvr = reflect.ValueOf(rcvr)
+	s.rcvrType = reflect.TypeOf(rcvr)
+
 	if name == "" {
 		s.name = reflect.Indirect(s.rcvr).Type().Name()
 		if !isExported(s.name) {
@@ -111,15 +164,15 @@ func (m *serviceMap) register(rcvr interface{}, name string) error {
 		return fmt.Errorf("rpc: %q has no exported methods of suitable type",
 			s.name)
 	}
-	// Add to the map.
-	m.mutex.Lock()
-	defer m.mutex.Unlock()
-	if m.services == nil {
-		m.services = make(map[string]*service)
-	} else if _, ok := m.services[s.name]; ok {
-		return fmt.Errorf("rpc: service already defined: %q", s.name)
-	}
-	m.services[s.name] = s
+	// // Add to the map.
+	// m.mutex.Lock()
+	// defer m.mutex.Unlock()
+	// if m.services == nil {
+	// 	m.services = make(map[string]*service)
+	// } else if _, ok := m.services[s.name]; ok {
+	// 	return fmt.Errorf("rpc: service already defined: %q", s.name)
+	// }
+	// m.services[s.name] = s
 	return nil
 }
 
@@ -127,19 +180,38 @@ func (m *serviceMap) register(rcvr interface{}, name string) error {
 //
 // The method name uses a dotted notation as in "Service.Method".
 func (m *serviceMap) get(method string) (*service, *serviceMethod, error) {
+	// 分割方法名，考虑到可能有多级服务名
 	parts := strings.Split(method, ".")
-	if len(parts) != 2 {
+	if len(parts) < 2 {
 		err := fmt.Errorf("rpc: service/method request ill-formed: %q", method)
 		return nil, nil, err
 	}
+
+	// 实际方法名
+	methodName := parts[len(parts)-1]
+
+	// 按层次遍历服务
 	m.mutex.Lock()
-	service := m.services[parts[0]]
-	m.mutex.Unlock()
-	if service == nil {
-		err := fmt.Errorf("rpc: can't find service %q", method)
-		return nil, nil, err
+	var service *service
+	for index, part := range parts {
+		if index == len(parts)-1 {
+			break
+		}
+
+		if service == nil {
+			service = m.services[part]
+		} else {
+			service = service.services[part]
+		}
+
+		if service == nil {
+			err := fmt.Errorf("rpc: can't find service %q", method)
+			return nil, nil, err
+		}
 	}
-	serviceMethod := service.methods[parts[1]]
+	m.mutex.Unlock()
+
+	serviceMethod := service.methods[methodName]
 	if serviceMethod == nil {
 		err := fmt.Errorf("rpc: can't find method %q", method)
 		return nil, nil, err