diff --git a/bucket.go b/bucket.go
index f780c6e..a6c4daa 100644
--- a/bucket.go
+++ b/bucket.go
@@ -2,38 +2,42 @@ package tcp
 
 import (
 	"sync"
+	"time"
 )
 
+//TCPConnBucket 用来存放和管理TCPConn连接
 type TCPConnBucket struct {
 	m  map[string]*TCPConn
 	mu *sync.RWMutex
 }
 
-func newTCPConnBucket() *TCPConnBucket {
-	return &TCPConnBucket{
+func NewTCPConnBucket() *TCPConnBucket {
+	tcb := &TCPConnBucket{
 		m:  make(map[string]*TCPConn),
 		mu: new(sync.RWMutex),
 	}
+	tcb.removeClosedTCPConnLoop()
+	return tcb
 }
 
-func (b *TCPConnBucket) Put(key string, c *TCPConn) {
+func (b *TCPConnBucket) Put(id string, c *TCPConn) {
 	b.mu.Lock()
-	b.m[key] = c
+	b.m[id] = c
 	b.mu.Unlock()
 }
 
-func (b *TCPConnBucket) Get(key string) *TCPConn {
+func (b *TCPConnBucket) Get(id string) *TCPConn {
 	b.mu.RLock()
 	defer b.mu.RUnlock()
-	if conn, ok := b.m[key]; ok {
+	if conn, ok := b.m[id]; ok {
 		return conn
 	}
 	return nil
 }
 
-func (b *TCPConnBucket) Delete(key string) {
+func (b *TCPConnBucket) Delete(id string) {
 	b.mu.Lock()
-	delete(b.m, key)
+	delete(b.m, id)
 	b.mu.Unlock()
 }
 func (b *TCPConnBucket) GetAll() map[string]*TCPConn {
@@ -45,3 +49,18 @@ func (b *TCPConnBucket) GetAll() map[string]*TCPConn {
 	}
 	return m
 }
+
+func (b *TCPConnBucket) removeClosedTCPConnLoop() {
+	go func() {
+		removeKey := make(map[string]struct{})
+		for key, conn := range b.GetAll() {
+			if conn.IsClosed() {
+				removeKey[key] = struct{}{}
+			}
+		}
+		for key := range removeKey {
+			b.Delete(key)
+		}
+		time.Sleep(time.Millisecond * 100)
+	}()
+}
diff --git a/callback.go b/callback.go
index a14b35e..cc330b0 100644
--- a/callback.go
+++ b/callback.go
@@ -1,9 +1,13 @@
 package tcp
 
+//CallBack 是一个回调接口，用于连接的各种事件处理
 type CallBack interface {
+	//链接建立回调
 	OnConnected(conn *TCPConn)
-
+	//消息处理回调
 	OnMessage(conn *TCPConn, p Packet)
-
+	//链接断开回调
 	OnDisconnected(conn *TCPConn)
+	//错误回调
+	// OnError(err error, conn *TCPConn)
 }
diff --git a/tcp_conn.go b/tcp_conn.go
index ab054f7..4d585fe 100644
--- a/tcp_conn.go
+++ b/tcp_conn.go
@@ -66,6 +66,7 @@ func (c *TCPConn) readLoop() {
 		default:
 			p, err := c.protocol.ReadPacket(c.conn)
 			if err != nil {
+				// c.callback.OnError(err, c)
 				return
 			}
 			c.readChan <- p
@@ -95,6 +96,7 @@ func (c *TCPConn) writeLoop() {
 				continue
 			}
 			if err := c.protocol.WritePacket(c.conn, p); err != nil {
+				// c.callback.OnError(err, c)
 				return
 			}
 		}
diff --git a/tcp_server.go b/tcp_server.go
index 7629ca1..d90ddb1 100644
--- a/tcp_server.go
+++ b/tcp_server.go
@@ -24,6 +24,7 @@ func init() {
 	logger = log.New(os.Stdout, "", log.Lshortfile)
 }
 
+//TCPServer 结构定义
 type TCPServer struct {
 	//TCP address to listen on
 	tcpAddr string
@@ -44,18 +45,20 @@ type TCPServer struct {
 	bucket        *TCPConnBucket
 }
 
+//NewTCPServer 返回一个TCPServer实例
 func NewTCPServer(tcpAddr string, callback CallBack, protocol Protocol) *TCPServer {
 	return &TCPServer{
 		tcpAddr:  tcpAddr,
 		callback: callback,
 		protocol: protocol,
 
-		bucket:        newTCPConnBucket(),
+		bucket:        NewTCPConnBucket(),
 		exitChan:      make(chan struct{}),
 		maxPacketSize: defaultMaxPacketSize,
 	}
 }
 
+//ListenAndServe 使用TCPServer的tcpAddr创建TCPListner并调用Server()方法开启监听
 func (srv *TCPServer) ListenAndServe() error {
 	tcpAddr, err := net.ResolveTCPAddr("tcp4", srv.tcpAddr)
 	if err != nil {
@@ -68,6 +71,7 @@ func (srv *TCPServer) ListenAndServe() error {
 	return srv.Serve(ln)
 }
 
+//Serve 使用指定的TCPListener开启监听
 func (srv *TCPServer) Serve(l *net.TCPListener) error {
 	srv.listener = l
 	defer func() {
@@ -76,12 +80,12 @@ func (srv *TCPServer) Serve(l *net.TCPListener) error {
 		}
 		srv.listener.Close()
 	}()
-	go func() {
-		for {
-			srv.removeClosedTCPConn()
-			time.Sleep(time.Millisecond * 10)
-		}
-	}()
+	// go func() {
+	// 	for {
+	// 		srv.removeClosedTCPConn()
+	// 		time.Sleep(time.Millisecond * 10)
+	// 	}
+	// }()
 
 	var tempDelay time.Duration
 	for {
@@ -121,6 +125,7 @@ func (srv *TCPServer) newTCPConn(conn *net.TCPConn, callback CallBack, protocol
 	return NewTCPConn(conn, callback, protocol)
 }
 
+//Connect 使用指定的callback和protocol连接其他TCPServer，返回TCPConn
 func (srv *TCPServer) Connect(ip string, callback CallBack, protocol Protocol) (*TCPConn, error) {
 	tcpAddr, err := net.ResolveTCPAddr("tcp", ip)
 	if err != nil {
@@ -136,6 +141,7 @@ func (srv *TCPServer) Connect(ip string, callback CallBack, protocol Protocol) (
 
 }
 
+//Close 首先关闭所有连接，然后关闭TCPServer
 func (srv *TCPServer) Close() {
 	defer srv.listener.Close()
 	for _, c := range srv.bucket.GetAll() {
@@ -145,25 +151,27 @@ func (srv *TCPServer) Close() {
 	}
 }
 
-func (srv *TCPServer) removeClosedTCPConn() {
-	for {
-		select {
-		case <-srv.exitChan:
-			return
-		default:
-			removeKey := make(map[string]struct{})
-			for key, conn := range srv.bucket.GetAll() {
-				if conn.IsClosed() {
-					removeKey[key] = struct{}{}
-				}
-			}
-			for key, _ := range removeKey {
-				srv.bucket.Delete(key)
-			}
-			time.Sleep(time.Millisecond * 10)
-		}
-	}
-}
+// func (srv *TCPServer) removeClosedTCPConn() {
+// 	for {
+// 		select {
+// 		case <-srv.exitChan:
+// 			return
+// 		default:
+// 			removeKey := make(map[string]struct{})
+// 			for key, conn := range srv.bucket.GetAll() {
+// 				if conn.IsClosed() {
+// 					removeKey[key] = struct{}{}
+// 				}
+// 			}
+// 			for key := range removeKey {
+// 				srv.bucket.Delete(key)
+// 			}
+// 			time.Sleep(time.Millisecond * 10)
+// 		}
+// 	}
+// }
+
+//GetAllTCPConn 返回所有客户端连接
 func (srv *TCPServer) GetAllTCPConn() []*TCPConn {
 	conns := []*TCPConn{}
 	for _, conn := range srv.bucket.GetAll() {