diff --git a/shadow/client.go b/shadow/client.go
index 72e5aaa..f0d85e7 100644
--- a/shadow/client.go
+++ b/shadow/client.go
@@ -61,38 +61,37 @@ func handlerClient(conn net.Conn, serverAddress string, fakeAddressSNI string) {
 
 	p := &PackAppData{Conn: dial.NetConn()}
 
-	go io.Copy(conn, p)
-	go io.Copy(p, conn)
+	defer p.Close()
+	defer conn.Close()
+	exitCh := make(chan int, 1)
+
+	go MyCopy(conn, p, exitCh)
+	go MyCopy(p, conn, exitCh)
+	<-exitCh
 }
 
-func MyCopy(src io.ReadWriteCloser, dst io.ReadWriteCloser) {
+func MyCopy(src io.ReadWriteCloser, dst io.ReadWriteCloser, ch chan int) {
 	buf := make([]byte, 32*1024)
 	for {
 		nr, er := src.Read(buf)
-		if nr > 0 {
-			nw, ew := dst.Write(buf[0:nr])
-			if nw < 0 || nr < nw {
-				nw = 0
-				if ew == nil {
-					fmt.Printf("err1:\n")
-				}
+		if er != nil {
+			if er == io.EOF {
+				break
+			} else {
+				fmt.Printf("Read err: %v\n", er)
+				break
 			}
+		} else {
+			nw, ew := dst.Write(buf[0:nr])
 			if ew != nil {
-				fmt.Printf("err2:%v\n", ew)
+				fmt.Printf("Write error:%v\n", ew)
 				break
 			}
 			if nr != nw {
-				fmt.Printf("nr != nw \n")
+				fmt.Printf("Write less then buffered \n")
 				break
 			}
 		}
-		if er != nil {
-			if er != io.EOF {
-				fmt.Printf("err3:%v\n", er)
-			} else {
-				fmt.Println("EOF")
-			}
-			break
-		}
 	}
+	ch <- 1
 }
diff --git a/shadow/client_test.go b/shadow/client_test.go
index 6dcfef8..d4ac593 100644
--- a/shadow/client_test.go
+++ b/shadow/client_test.go
@@ -23,6 +23,14 @@ func TestName(t *testing.T) {
 }
 
 func TestName2(t *testing.T) {
-	v := "12345678"
-	fmt.Println(v[2:2])
+	b := []byte("ABC")
+	encrypt, err := AesEncrypt(b, []byte("1234567812345678"))
+	if err != nil {
+		fmt.Println(err)
+	}
+	decrypt, err := AesDecrypt(encrypt, []byte("1234567812345678"))
+	if err != nil {
+		fmt.Println(err)
+	}
+	fmt.Println(string(decrypt))
 }
diff --git a/shadow/packer.go b/shadow/packer.go
index 1f8edad..f8b7608 100644
--- a/shadow/packer.go
+++ b/shadow/packer.go
@@ -3,12 +3,14 @@ package shadow
 import (
 	"bytes"
 	"encoding/binary"
+	"errors"
 	"fmt"
+	"io"
 	"net"
 )
 
 var (
-	AppDataHeader = []byte("GGGGGGGG")
+	AppDataHeader = []byte{0x17, 0x3, 0x3}
 	HeaderLength  = len(AppDataHeader)
 )
 
@@ -17,25 +19,48 @@ type PackAppData struct {
 }
 
 func (m PackAppData) Read(p []byte) (n int, err error) {
-	buf := make([]byte, 32*1024)
-	read, err := m.Conn.Read(buf[0 : HeaderLength+2])
+
+	buf := make([]byte, 32*1024+HeaderLength+2)
+
+	headRead, err := io.ReadAtLeast(m.Conn, buf[0:HeaderLength+2], HeaderLength+2)
+	if err != nil {
+		fmt.Printf("Read header error: %v\n", err)
+		return 0, err
+	}
+	if headRead < HeaderLength+2 {
+		return 0, errors.New("Read header failed")
+	}
 	if bytes.Equal(buf[0:HeaderLength], AppDataHeader) {
-		u := int(binary.BigEndian.Uint16(buf[HeaderLength : HeaderLength+2]))
-		r, err := m.Conn.Read(buf[HeaderLength+2 : u+HeaderLength+2])
-		copy(p, buf[HeaderLength+2:r+HeaderLength+2])
-		return r, err
+		payLoadLength := int(binary.BigEndian.Uint16(buf[HeaderLength : HeaderLength+2]))
+		sum := 0
+		for sum < payLoadLength {
+			r, e := m.Conn.Read(buf[HeaderLength+2+sum : HeaderLength+2+payLoadLength])
+			if e != nil {
+				if e == io.EOF {
+					break
+				} else {
+					return 0, e
+				}
+			}
+			copy(p[sum:], buf[HeaderLength+2+sum:HeaderLength+2+sum+r])
+			sum += r
+		}
+		return sum, err
 	} else {
-		fmt.Println("Header is not present")
-		return read, err
+		fmt.Printf("Invalid header")
+		return 0, errors.New("invalid header")
 	}
 }
 
 func (m PackAppData) Write(p []byte) (n int, err error) {
-	t := make([]byte, len(p)+HeaderLength+2)
-	copy(t[0:], AppDataHeader)
-	binary.BigEndian.PutUint16(t[HeaderLength:], uint16(len(p)))
-	copy(t[HeaderLength+2:], p)
-	write, err := m.Conn.Write(t)
+	lenNum := make([]byte, 2)
+	binary.BigEndian.PutUint16(lenNum, uint16(len(p)))
+
+	packetBuf := bytes.NewBuffer(AppDataHeader)
+	packetBuf.Write(lenNum)
+	packetBuf.Write(p)
+
+	write, err := m.Conn.Write(packetBuf.Bytes())
 	write = write - HeaderLength - 2
 	return write, err
 }
diff --git a/shadow/server.go b/shadow/server.go
index 4f7d9f0..f76cb6b 100644
--- a/shadow/server.go
+++ b/shadow/server.go
@@ -70,8 +70,66 @@ func handler(conn net.Conn, targetAddress string, fakeAddress string) {
 	}
 
 	p := &PackAppData{Conn: conn}
-	go io.Copy(realConnection, p)
-	go io.Copy(p, realConnection)
+
+	defer p.Close()
+	defer realConnection.Close()
+	exit := make(chan int, 1)
+
+	go MyCopy(p, realConnection, exit)
+	go MyCopy(realConnection, p, exit)
+	<-exit
+
+	//go func() {
+	//	buf := make([]byte, 64*1024)
+	//	for {
+	//		nr, er := realConnection.Read(buf)
+	//		if er != nil {
+	//			if er == io.EOF {
+	//				continue
+	//			} else {
+	//				fmt.Println("read err:", er)
+	//				break
+	//			}
+	//		} else {
+	//			lenNum := make([]byte, 2)
+	//			binary.BigEndian.PutUint16(lenNum, uint16(nr))
+	//
+	//			packetBuf := bytes.NewBuffer(AppDataHeader)
+	//			packetBuf.Write(lenNum)
+	//			packetBuf.Write(buf[0:nr])
+	//
+	//			_, ew := conn.Write(packetBuf.Bytes())
+	//			if ew != nil {
+	//				fmt.Printf("err2:%v\n", ew)
+	//				break
+	//			}
+	//		}
+	//	}
+	//}()
+	//
+	//go func() {
+	//	result := bytes.NewBuffer(nil)
+	//	var buf [65542]byte // 由于 标识数据包长度 的只有两个字节 故数据包最大为 2^16+4(魔数)+2(长度标识)
+	//	for {
+	//		n, er := conn.Read(buf[0:])
+	//		result.Write(buf[0:n])
+	//		if er != nil {
+	//			if er == io.EOF {
+	//				continue
+	//			} else {
+	//				fmt.Println("read err:", er)
+	//				break
+	//			}
+	//		} else {
+	//			scanner := bufio.NewScanner(result)
+	//			scanner.Split(packetSlitFunc)
+	//			for scanner.Scan() {
+	//				realConnection.Write(scanner.Bytes()[HeaderLength+2:])
+	//			}
+	//		}
+	//		result.Reset()
+	//	}
+	//}()
 }
 
 func processHandshake(src net.Conn, dst net.Conn, waitCh chan int) {