diff --git a/examples/defaultServer/callback.go b/examples/defaultServer/callback.go
new file mode 100644
index 0000000..7e147d5
--- /dev/null
+++ b/examples/defaultServer/callback.go
@@ -0,0 +1,24 @@
+package main
+
+import (
+	"log"
+
+	"github.com/wuyingsong/tcp"
+)
+
+type callback struct{}
+
+func (c *callback) OnMessage(conn *tcp.TCPConn, p tcp.Packet) {
+	log.Println("server receive:", string(p.Bytes()[1:]))
+}
+
+func (c *callback) OnConnected(conn *tcp.TCPConn) {
+	log.Println("new conn:", conn.GetRemoteAddr().String())
+}
+
+func (c *callback) OnDisconnected(conn *tcp.TCPConn) {
+	for err := range conn.Errors() {
+		log.Println(err)
+	}
+	log.Printf("%s disconnected\n", conn.GetRemoteIPAddress())
+}
diff --git a/examples/defaultServer/client.go b/examples/defaultServer/client.go
new file mode 100644
index 0000000..2c64dd2
--- /dev/null
+++ b/examples/defaultServer/client.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"time"
+
+	"github.com/wuyingsong/tcp"
+)
+
+func startClient(callback tcp.CallBack, protocol tcp.Protocol) {
+	tcpAddr, err := net.ResolveTCPAddr("tcp", "localhost:9001")
+	if err != nil {
+		panic(err)
+	}
+	conn, err := net.DialTCP("tcp", nil, tcpAddr)
+	if err != nil {
+		panic(err)
+	}
+	tc := tcp.NewTCPConn(conn, callback, protocol)
+	log.Println(tc.Serve())
+	i := 0
+	for {
+		if tc.IsClosed() {
+			break
+		}
+		msg := fmt.Sprintf("hello %d", i)
+		log.Println("client send: ", msg)
+		tc.AsyncWritePacket(&tcp.DefaultPacket{Type: 1, Body: []byte(msg)})
+		i++
+		time.Sleep(time.Second)
+	}
+}
diff --git a/examples/defaultServer/main.go b/examples/defaultServer/main.go
new file mode 100644
index 0000000..c334035
--- /dev/null
+++ b/examples/defaultServer/main.go
@@ -0,0 +1,11 @@
+package main
+
+import "github.com/wuyingsong/tcp"
+
+func main() {
+	protocol := &tcp.DefaultProtocol{}
+	protocol.SetMaxPacketSize(100)
+	go startServer(&callback{}, protocol)
+	go startClient(nil, protocol)
+	select {}
+}
diff --git a/examples/defaultServer/server.go b/examples/defaultServer/server.go
new file mode 100644
index 0000000..7975f6f
--- /dev/null
+++ b/examples/defaultServer/server.go
@@ -0,0 +1,10 @@
+package main
+
+import (
+	"github.com/wuyingsong/tcp"
+)
+
+func startServer(callback tcp.CallBack, protocol tcp.Protocol) error {
+	srv := tcp.NewAsyncTCPServer("localhost:9001", callback, protocol)
+	return srv.ListenAndServe()
+}
diff --git a/examples/echoServer/callback.go b/examples/echoServer/callback.go
new file mode 100644
index 0000000..a0b433b
--- /dev/null
+++ b/examples/echoServer/callback.go
@@ -0,0 +1,23 @@
+package main
+
+import (
+	"log"
+
+	"github.com/wuyingsong/tcp"
+)
+
+type EchoCallback struct{}
+
+func (ec *EchoCallback) OnConnected(conn *tcp.TCPConn) {
+	log.Println("new conn: ", conn.GetRemoteIPAddress())
+}
+func (ec *EchoCallback) OnMessage(conn *tcp.TCPConn, p tcp.Packet) {
+	log.Printf("receive: %s", string(p.Bytes()))
+	conn.AsyncWritePacket(p)
+}
+func (ec *EchoCallback) OnDisconnected(conn *tcp.TCPConn) {
+	for err := range conn.Errors() {
+		log.Println(err)
+	}
+	log.Printf("%s disconnected\n", conn.GetRemoteIPAddress())
+}
diff --git a/examples/echoServer/protocol.go b/examples/echoServer/protocol.go
new file mode 100644
index 0000000..2eda8e7
--- /dev/null
+++ b/examples/echoServer/protocol.go
@@ -0,0 +1,29 @@
+package main
+
+import (
+	"bufio"
+	"io"
+
+	"github.com/wuyingsong/tcp"
+)
+
+type EchoProtocol struct {
+	data []byte
+}
+
+func (ep *EchoProtocol) Bytes() []byte {
+	return ep.data
+}
+
+func (ep *EchoProtocol) ReadPacket(reader io.Reader) (tcp.Packet, error) {
+	rd := bufio.NewReader(reader)
+	bytesData, err := rd.ReadBytes('\n')
+	if err != nil {
+		return nil, err
+	}
+	return &EchoProtocol{data: bytesData}, nil
+}
+func (ep *EchoProtocol) WritePacket(writer io.Writer, msg tcp.Packet) error {
+	_, err := writer.Write(msg.Bytes())
+	return err
+}
diff --git a/examples/echoServer/server.go b/examples/echoServer/server.go
new file mode 100644
index 0000000..5d922b4
--- /dev/null
+++ b/examples/echoServer/server.go
@@ -0,0 +1,15 @@
+package main
+
+import (
+	"log"
+	"time"
+
+	"github.com/wuyingsong/tcp"
+)
+
+func main() {
+	srv := tcp.NewAsyncTCPServer("localhost:9001", &EchoCallback{}, &EchoProtocol{})
+	srv.SetReadDeadline(time.Second * 30)
+	srv.SetWriteDeadline(time.Second * 30)
+	log.Println(srv.ListenAndServe())
+}