diff --git a/networkProgram/NetworkProgram.log b/networkProgram/NetworkProgram.log
index 4064c7a..639691c 100644
--- a/networkProgram/NetworkProgram.log
+++ b/networkProgram/NetworkProgram.log
@@ -17,3 +17,20 @@ IPv4这个版本规定，网络地址由32个二进制位组成，我们通常
 也就是说，我们还需要一个参数，表示这个数据包到底供哪个程序（进程）使用。这个参数就叫做"端口”（port），它其实是每一个使用网卡的程序的编号。
 每个数据包都发到主机的特定端口，所以不同的程序就能取到自己所需要的数据。
 “端口"是0到65535之间的一个整数，正好16个二进制位。0到1023的端口被系统占用，用户只能选用大于1023的端口。有了IP和端口我们就能实现唯一确定互联网上一个程序，进而实现网络间的程序通信。
+
+
+TCP服务端程序的处理流程：
+
+1.监听端口
+2.接收客户端请求建立链接
+3.创建goroutine处理链接。
+
+一个TCP客户端进行TCP通信的流程如下：
+
+1.建立与服务端的链接
+2.进行数据收发
+3.关闭链接
+
+TCP粘包
+引申知识点:
+大端和小端{https://zhuanlan.zhihu.com/p/680366680}
\ No newline at end of file
diff --git a/networkProgram/TCP_client.go b/networkProgram/TCP/TCP_client.go
similarity index 100%
rename from networkProgram/TCP_client.go
rename to networkProgram/TCP/TCP_client.go
diff --git a/networkProgram/TCP_server.go b/networkProgram/TCP/TCP_server.go
similarity index 94%
rename from networkProgram/TCP_server.go
rename to networkProgram/TCP/TCP_server.go
index c1861d6..a0ba572 100644
--- a/networkProgram/TCP_server.go
+++ b/networkProgram/TCP/TCP_server.go
@@ -12,10 +12,11 @@ import (
 //TCP server端
 
 func process(conn net.Conn) {
+	defer conn.Close()
 	var tmp = make([]byte, 1024)
 	reader := bufio.NewReader(os.Stdin)
 	for {
-		n, err := conn.Read(tmp[:])
+		n, err := conn.Read(tmp)
 		if err != nil {
 			log.Fatal("read failed on:", err)
 			return
diff --git a/networkProgram/TCP/packet_splicing_client.go b/networkProgram/TCP/packet_splicing_client.go
new file mode 100644
index 0000000..ce6dad1
--- /dev/null
+++ b/networkProgram/TCP/packet_splicing_client.go
@@ -0,0 +1,28 @@
+package main
+
+import (
+	"fmt"
+	"net"
+
+	"course/networkProgram/protocol"
+)
+
+// socket_stick/client/main.go
+
+func main() {
+	conn, err := net.Dial("tcp", "127.0.0.1:30000")
+	if err != nil {
+		fmt.Println("dial failed, err", err)
+		return
+	}
+	defer conn.Close()
+	for i := 0; i < 20; i++ {
+		msg := `Hello, Hello. How are you?`
+		b, err := proto.Encode(msg)
+		if err != nil {
+			fmt.Println("encode failed, err", err)
+		}
+		conn.Write(b)
+		//time.Sleep(1 * time.Second)
+	}
+}
diff --git a/networkProgram/TCP/packet_splicing_server.go b/networkProgram/TCP/packet_splicing_server.go
new file mode 100644
index 0000000..54656fc
--- /dev/null
+++ b/networkProgram/TCP/packet_splicing_server.go
@@ -0,0 +1,44 @@
+package main
+
+import (
+	"bufio"
+	proto "course/networkProgram/protocol"
+	"fmt"
+	"io"
+	"net"
+)
+
+// socket_stick/server/main.go
+func proc(conn net.Conn) {
+	defer conn.Close()
+	reader := bufio.NewReader(conn)
+	for {
+		msg, err := proto.Decode(reader)
+		if err == io.EOF {
+			return
+		}
+		if err != nil {
+			fmt.Println("decode msg failed, err:", err)
+			return
+		}
+		fmt.Println("收到client发来的数据：", msg)
+	}
+}
+
+func main() {
+
+	listen, err := net.Listen("tcp", "127.0.0.1:30000")
+	if err != nil {
+		fmt.Println("listen failed, err:", err)
+		return
+	}
+	defer listen.Close()
+	for {
+		conn, err := listen.Accept()
+		if err != nil {
+			fmt.Println("accept failed, err:", err)
+			continue
+		}
+		go proc(conn)
+	}
+}
diff --git a/networkProgram/UDP/udp_client.go b/networkProgram/UDP/udp_client.go
new file mode 100644
index 0000000..84c95fb
--- /dev/null
+++ b/networkProgram/UDP/udp_client.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"net"
+	"os"
+)
+
+//UDP client
+
+func main() {
+	socket, err := net.DialUDP("udp", nil, &net.UDPAddr{
+		IP:   net.IPv4(127, 0, 0, 1),
+		Port: 40000,
+	})
+	if err != nil {
+		log.Fatal("连接服务端失败，err", err)
+		return
+	}
+	defer socket.Close()
+	reader := bufio.NewReader(os.Stdin)
+	reply := make([]byte, 512)
+	for {
+		fmt.Print("> ")
+		msg, _ := reader.ReadString('\n')
+		socket.Write([]byte(msg))
+		//收回复的数据
+		n, _, err := socket.ReadFromUDP(reply)
+		if err != nil {
+			fmt.Println("read reply msg failed:", err)
+			return
+		}
+		fmt.Print(string(reply[:n]))
+
+	}
+
+}
diff --git a/networkProgram/UDP/udp_server.go b/networkProgram/UDP/udp_server.go
new file mode 100644
index 0000000..b02a0c3
--- /dev/null
+++ b/networkProgram/UDP/udp_server.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"strings"
+)
+
+// UDP sever
+func main() {
+	conn, err := net.ListenUDP("udp", &net.UDPAddr{
+		IP:   net.IPv4(127, 0, 0, 1),
+		Port: 40000,
+	})
+	if err != nil {
+		log.Fatal("listen udp failed:", err)
+		return
+	}
+	defer conn.Close()
+	//不需要建立链接，直接收发数据
+	data := make([]byte, 1024)
+	for {
+		n, addr, err := conn.ReadFromUDP(data)
+		if err != nil {
+			log.Println("read from udp failed:", err)
+		}
+		fmt.Printf("%s\n", data[:n])
+		reply := string(data[:n])
+		reply = strings.ToUpper(reply)
+		//发送数据
+		conn.WriteToUDP([]byte(reply), addr)
+	}
+}
diff --git a/networkProgram/protocol/protocol.go b/networkProgram/protocol/protocol.go
new file mode 100644
index 0000000..546360e
--- /dev/null
+++ b/networkProgram/protocol/protocol.go
@@ -0,0 +1,50 @@
+// socket_stick/proto/proto.go
+package proto
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/binary"
+)
+
+// Encode 将消息编码
+func Encode(message string) ([]byte, error) {
+	// 读取消息的长度，转换成int32类型（占4个字节）
+	var length = int32(len(message))
+	var pkg = new(bytes.Buffer)
+	// 写入消息头
+	err := binary.Write(pkg, binary.LittleEndian, length)
+	if err != nil {
+		return nil, err
+	}
+	// 写入消息实体
+	err = binary.Write(pkg, binary.LittleEndian, []byte(message))
+	if err != nil {
+		return nil, err
+	}
+	return pkg.Bytes(), nil
+}
+
+// Decode 解码消息
+func Decode(reader *bufio.Reader) (string, error) {
+	// 读取消息的长度
+	lengthByte, _ := reader.Peek(4) // 读取前4个字节的数据
+	lengthBuff := bytes.NewBuffer(lengthByte)
+	var length int32
+	err := binary.Read(lengthBuff, binary.LittleEndian, &length)
+	if err != nil {
+		return "", err
+	}
+	// Buffered返回缓冲中现有的可读取的字节数。
+	if int32(reader.Buffered()) < length+4 {
+		return "", err
+	}
+
+	// 读取真正的消息数据
+	pack := make([]byte, int(4+length))
+	_, err = reader.Read(pack)
+	if err != nil {
+		return "", err
+	}
+	return string(pack[4:]), nil
+}