diff --git a/protocol/tunnel.go b/protocol/tunnel.go
index 0c4476a..2057903 100644
--- a/protocol/tunnel.go
+++ b/protocol/tunnel.go
@@ -49,6 +49,7 @@ func (this *Tunnel) run() { //单向的，从src发送到dest
 	cipherDirection := this.cipherDirection
 	id := this.id
 	defer func() {
+		log.Info("tunnel id %s ends", id)
 		if r := recover(); r != nil {
 			if src != nil {
 				src.Close()
@@ -56,7 +57,6 @@ func (this *Tunnel) run() { //单向的，从src发送到dest
 			if dest != nil {
 				dest.Close()
 			}
-
 		}
 	}()
 	cache := make([]byte, 1024*4) //4kB
diff --git a/tscipher/cipher.go b/tscipher/cipher.go
index 7476126..df3e9c1 100644
--- a/tscipher/cipher.go
+++ b/tscipher/cipher.go
@@ -49,14 +49,14 @@ func NewCarrier(conn net.Conn, cipher Cipher, cache []byte, id string) *Carrier
 	t.Cipher = cipher
 	t.Cache = cache
 	t.AttachedTunnelID = id
-	t.receiveBuff = make([]byte, 0, len(cache)*8)
+	t.receiveBuff = make([]byte, 0, len(cache))
 	return t
 }
 
 func (this *Carrier) GetReceiveBuff() []byte {
 	log.Debug("id %d receivebuff Get, len %d", this.AttachedTunnelID, len(this.receiveBuff))
 	buff := this.receiveBuff
-	_b := make([]byte, len(buff), cap(buff))
+	_b := make([]byte, len(buff), cap(buff)) //必须这样写，没错。
 	copy(_b, buff)
 	return _b
 }
@@ -82,6 +82,8 @@ func NewCipher(cipherName string) (cipher Cipher) {
 func WrapPackage(data []byte) []byte { //把要加密传输的数据打包成一定的格式，避免发送了100自己，只收到90字节的问题。
 	sizeOfData := len(data)
 	binSize := utils.Int2binary(sizeOfData, 10)
+	// header := make([]byte, 18)
+	// header = append(append(append(header, StartMark...), binSize...), EndMark...)
 	header := append(append(StartMark, binSize...), EndMark...)
 	// log.Error("size of header %d %x", len(header), header)
 	//加密