diff --git a/lib/mux/conn.go b/lib/mux/conn.go
index 08b0db0..8f9f3ec 100644
--- a/lib/mux/conn.go
+++ b/lib/mux/conn.go
@@ -52,6 +52,7 @@ func NewConn(connId int32, mux *Mux) *conn {
 }
 
 func (s *conn) Read(buf []byte) (n int, err error) {
+	logs.Warn("starting conn read", s.connId)
 	if s.isClose || buf == nil {
 		return 0, errors.New("the conn has closed")
 	}
@@ -315,7 +316,7 @@ func (Self *window) allowRead() (closed bool) {
 }
 
 func (Self *window) Read(p []byte) (n int, err error) {
-	//logs.Warn("starting window read method len ", Self.len())
+	logs.Warn("starting window read method len ", Self.len())
 	if Self.closeOp {
 		return 0, io.EOF // Write method receive close signal, returns eof
 	}
diff --git a/lib/mux/mux.go b/lib/mux/mux.go
index 9310c64..5ad43c4 100644
--- a/lib/mux/mux.go
+++ b/lib/mux/mux.go
@@ -179,12 +179,14 @@ func (s *Mux) readSession() {
 			switch pack.Flag {
 			case common.MUX_NEW_CONN: //new connection
 				logs.Warn("rec mux new connection", pack.Id)
-				conn := NewConn(pack.Id, s)
-				s.connMap.Set(pack.Id, conn) //it has been set before send ok
-				s.newConnCh <- conn
-				go conn.sendWindow.SetAllowSize(512) // set the initial receive window
-				s.sendInfo(common.MUX_NEW_CONN_OK, pack.Id, nil)
-				logs.Warn("send mux new connection ok", pack.Id)
+				connection := NewConn(pack.Id, s)
+				s.connMap.Set(pack.Id, connection) //it has been set before send ok
+				go func(connection *conn) {
+					connection.sendWindow.SetAllowSize(512) // set the initial receive window
+				}(connection)
+				s.newConnCh <- connection
+				s.sendInfo(common.MUX_NEW_CONN_OK, connection.connId, nil)
+				logs.Warn("send mux new connection ok", connection.connId)
 				continue
 			case common.MUX_PING_FLAG: //ping
 				//logs.Warn("send mux ping return")
@@ -202,7 +204,7 @@ func (s *Mux) readSession() {
 						continue
 					}
 					connection.receiveWindow.WriteWg.Add(1)
-					logs.Warn("rec mux new msg ", pack.Id, string(pack.Content[0:15]))
+					logs.Warn("rec mux new msg ", connection.connId, string(pack.Content[0:15]))
 					go func(connection *conn, content []byte) { // do not block read session
 						_, err := connection.receiveWindow.Write(content)
 						if err != nil {
@@ -214,7 +216,7 @@ func (s *Mux) readSession() {
 							connection.receiveWindow.WindowFull = true
 						}
 						s.sendInfo(common.MUX_MSG_SEND_OK, connection.connId, size)
-						logs.Warn("send mux new msg ok", pack.Id, size)
+						logs.Warn("send mux new msg ok", connection.connId, size)
 						connection.receiveWindow.WriteWg.Done()
 					}(connection, pack.Content)
 					continue
@@ -241,7 +243,9 @@ func (s *Mux) readSession() {
 					s.connMap.Delete(pack.Id)
 					connection.closeFlag = true
 					go func(connection *conn) {
+						logs.Warn("receive mux connection close, wg waiting", connection.connId)
 						connection.receiveWindow.WriteWg.Wait()
+						logs.Warn("receive mux connection close, wg waited", connection.connId)
 						connection.receiveWindow.WriteEndOp <- struct{}{} // close signal to receive window
 						logs.Warn("receive mux connection close, finish", connection.connId)
 					}(connection)
diff --git a/lib/mux/mux_test.go b/lib/mux/mux_test.go
index 7c75c10..91e0fc6 100644
--- a/lib/mux/mux_test.go
+++ b/lib/mux/mux_test.go
@@ -6,6 +6,7 @@ import (
 	"net"
 	"net/http"
 	_ "net/http/pprof"
+	"sync"
 	"testing"
 	"time"
 )
@@ -37,20 +38,29 @@ func TestNewMux(t *testing.T) {
 				logs.Warn(err)
 				continue
 			}
+			wg := sync.WaitGroup{}
+			wg.Add(1)
 			go func() {
 				_, err = common.CopyBuffer(c2, c)
 				if err != nil {
-					logs.Warn("close npc by copy from nps", err)
 					c2.Close()
 					c.Close()
+					logs.Warn("close npc by copy from nps", err)
 				}
+				wg.Done()
 			}()
-			_, err = common.CopyBuffer(c, c2)
-			if err != nil {
-				logs.Warn("close npc by copy from server", err)
-				c2.Close()
-				c.Close()
-			}
+			wg.Add(1)
+			go func() {
+				_, err = common.CopyBuffer(c, c2)
+				if err != nil {
+					c2.Close()
+					c.Close()
+					logs.Warn("close npc by copy from server", err)
+				}
+				wg.Done()
+			}()
+			logs.Warn("npc wait")
+			wg.Wait()
 		}
 	}()
 
@@ -77,17 +87,17 @@ func TestNewMux(t *testing.T) {
 			go func() {
 				_, err := common.CopyBuffer(tmpCpnn, conn)
 				if err != nil {
-					logs.Warn("close nps by copy from user", tmpCpnn.connId)
 					conn.Close()
 					tmpCpnn.Close()
+					logs.Warn("close nps by copy from user", tmpCpnn.connId)
 				}
 			}()
 			//time.Sleep(time.Second)
 			_, err = common.CopyBuffer(conn, tmpCpnn)
 			if err != nil {
-				logs.Warn("close nps by copy from npc ", tmpCpnn.connId)
 				conn.Close()
 				tmpCpnn.Close()
+				logs.Warn("close nps by copy from npc ", tmpCpnn.connId)
 			}
 		}
 	}()