diff --git a/channel.go b/channel.go
new file mode 100644
index 0000000..b1fc4fa
--- /dev/null
+++ b/channel.go
@@ -0,0 +1,40 @@
+package webreal
+
+import "sync"
+
+type Channel struct {
+	mu          sync.RWMutex
+	subscribers map[string]*Client
+}
+
+func NewChannel() *Channel {
+	return &Channel{
+		subscribers: map[string]*Client{},
+	}
+}
+
+// 添加客户端
+func (c *Channel) Add(client *Client) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	c.subscribers[client.id] = client
+}
+
+// 移除客户端
+func (c *Channel) Remove(client *Client) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	delete(c.subscribers, client.id)
+}
+
+// 遍历客户端
+func (c *Channel) Range(f func(client *Client)) {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	for _, client := range c.subscribers {
+		f(client)
+	}
+}
diff --git a/client.go b/client.go
index b34fe75..7220f77 100644
--- a/client.go
+++ b/client.go
@@ -103,19 +103,16 @@ func (c *Client) close() {
 }
 
 // 订阅
-func (c *Client) Subscribe(channel string) bool {
+func (c *Client) Subscribe(channel string) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
-	_, found := c.channels[channel]
-	if found {
-		return false
+	if _, found := c.channels[channel]; found {
+		return
 	}
-	if c.hub.Subscribe(channel, c) {
-		c.channels[channel] = struct{}{}
-		return true
-	}
-	return false
+
+	c.hub.Subscribe(channel, c)
+	c.channels[channel] = struct{}{}
 }
 
 // 退订
@@ -123,9 +120,8 @@ func (c *Client) Unsubscribe(channel string) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
-	if c.hub.Unsubscribe(channel, c) {
-		delete(c.channels, channel)
-	}
+	c.hub.Unsubscribe(channel, c)
+	delete(c.channels, channel)
 }
 
 // 退订所有
@@ -139,26 +135,6 @@ func (c *Client) UnsubscribeAll() {
 	c.channels = map[string]struct{}{}
 }
 
-// 获取已订阅的主题列表
-func (c *Client) Channels() []string {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	var channels []string
-	for key := range c.channels {
-		channels = append(channels, key)
-	}
-	return channels
-}
-
-// 获取已订阅长度
-func (c *Client) ChannelsLen() int {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	return len(c.channels)
-}
-
 // 获取客户端ID
 func (c *Client) ID() string {
 	return c.id
diff --git a/subscription.go b/subscription.go
index 2b90107..d876dcc 100644
--- a/subscription.go
+++ b/subscription.go
@@ -4,57 +4,44 @@ import "sync"
 
 // 订阅中心，存储的所有频道和客户端订阅的对应关系
 type SubscriptionHub struct {
-	mu sync.RWMutex
-
-	// channel => clientId => Client
-	subscribers map[string]map[string]*Client
+	mu       sync.Mutex
+	channels map[string]*Channel
 }
 
 func NewSubscriptionHub() *SubscriptionHub {
 	return &SubscriptionHub{
-		subscribers: map[string]map[string]*Client{},
+		channels: map[string]*Channel{},
 	}
 }
 
 // 订阅主题
-func (s *SubscriptionHub) Subscribe(channel string, client *Client) bool {
+func (s *SubscriptionHub) Subscribe(channel string, client *Client) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
-	if _, ok := s.subscribers[channel]; !ok {
-		s.subscribers[channel] = map[string]*Client{}
+	if _, found := s.channels[channel]; !found {
+		s.channels[channel] = NewChannel()
 	}
 
-	s.subscribers[channel][client.id] = client
-	return true
+	s.channels[channel].Add(client)
 }
 
 // 退订主题
-func (s *SubscriptionHub) Unsubscribe(channel string, client *Client) bool {
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
-	if _, ok := s.subscribers[channel]; !ok {
-		return false
-	}
-	if _, ok := s.subscribers[channel][client.id]; !ok {
-		return false
+func (s *SubscriptionHub) Unsubscribe(channel string, client *Client) {
+	if _, found := s.channels[channel]; !found {
+		return
 	}
 
-	delete(s.subscribers[channel], client.id)
-	return true
+	s.channels[channel].Remove(client)
 }
 
 // 向客户端推送主题消息
 func (s *SubscriptionHub) Publish(channel string, msg []byte) {
-	s.mu.RLock()
-	defer s.mu.RUnlock()
-
-	if _, ok := s.subscribers[channel]; !ok {
+	if _, found := s.channels[channel]; !found {
 		return
 	}
 
-	for _, c := range s.subscribers[channel] {
+	s.channels[channel].Range(func(c *Client) {
 		c.Write(msg)
-	}
+	})
 }