diff --git a/client/webrtc_demo/src/mainwindow.cpp b/client/webrtc_demo/src/mainwindow.cpp
index 1084b38..1f012fb 100644
--- a/client/webrtc_demo/src/mainwindow.cpp
+++ b/client/webrtc_demo/src/mainwindow.cpp
@@ -64,8 +64,6 @@ MainWindow::MainWindow(QWidget *parent)
     ui->setupUi(this);
     ui->openGLWidget->show();
 
-    mHandler->InitWebrtc();
-    this->mLocalVideoTrack = mHandler->VideoTrack();
     TCHAR username[UNLEN + 1];
     DWORD size = UNLEN + 1;
     GetUserName((TCHAR*)username, &size);
@@ -98,10 +96,13 @@ void WebrtcHanlder::SetRemotePeerName(QString remote)
 WebrtcHanlder::WebrtcHanlder()
 {
     mVideoTrack = nullptr;
+    mAudioTrack = nullptr;
+    m_peer_connection_factory_ = nullptr;
 }
 
 int WebrtcHanlder::InitWebrtc()
 {
+
     m_peer_connection_factory_ = webrtc::CreatePeerConnectionFactory(
     nullptr /* network_thread */, nullptr /* worker_thread */,
     nullptr /* signaling_thread */, nullptr /* default_adm */,
@@ -125,6 +126,9 @@ int WebrtcHanlder::InitWebrtc()
     server.uri = "stun:stun.l.google.com:19302";  // stun服务器
     config.servers.push_back(server);
 
+    if(m_peer_connection_ != nullptr){
+        m_peer_connection_.release();
+    }
     m_peer_connection_ = m_peer_connection_factory_->CreatePeerConnection(
     config, nullptr, nullptr, this);
 
@@ -134,38 +138,7 @@ int WebrtcHanlder::InitWebrtc()
         x->show();
         exit(0);
     }
-
-    rtc::scoped_refptr<webrtc::AudioTrackInterface> audio_track(
-        m_peer_connection_factory_->CreateAudioTrack(
-            kAudioLabel, m_peer_connection_factory_->CreateAudioSource(
-            cricket::AudioOptions())));
-
-    auto result_or_error = m_peer_connection_->AddTrack(audio_track, {kStreamId});
-    if (!result_or_error.ok()) {
-        qDebug() << "Failed to add audio track to PeerConnection: "
-                        << result_or_error.error().message();
-    }
-
-    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
-                 " m_peer_connection_ AddTrack" + kAudioLabel).toStdString());
-    rtc::scoped_refptr<MyCapturer> video_device = new rtc::RefCountedObject<MyCapturer>();
-    if (video_device) {
-        video_device->startCapturer();
-        rtc::scoped_refptr<webrtc::VideoTrackInterface> video_track_(
-            m_peer_connection_factory_->CreateVideoTrack(kVideoLabel, video_device));
-        qDebug()<<"local track is "<<video_track_->id().c_str();
-        result_or_error = m_peer_connection_->AddTrack(video_track_, { kStreamId });
-        mVideoTrack = video_track_.get();
-        video_track_->AddRef();
-        if (!result_or_error.ok()) {
-            qDebug() << "Failed to add video track to PeerConnection: "
-                << result_or_error.error().message();
-        }
-        gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
-                     " m_peer_connection_ AddTrack" + kVideoLabel).toStdString());
-    } else {
-        qDebug()<< "OpenVideoCaptureDevice failed";
-    }
+    AddLocalTrack();
 }
 
 
@@ -269,6 +242,61 @@ webrtc::VideoTrackInterface *WebrtcHanlder::VideoTrack()
     return mVideoTrack;
 }
 
+void WebrtcHanlder::AddLocalTrack()
+{
+    if(mAudioTrack == nullptr){
+        rtc::scoped_refptr<webrtc::AudioTrackInterface> audio_track(
+            m_peer_connection_factory_->CreateAudioTrack(
+                kAudioLabel, m_peer_connection_factory_->CreateAudioSource(
+                cricket::AudioOptions())));
+
+        auto result_or_error = m_peer_connection_->AddTrack(audio_track, {kStreamId});
+        if (!result_or_error.ok()) {
+            qDebug() << "Failed to add audio track to PeerConnection: "
+                            << result_or_error.error().message();
+        }
+        mAudioTrack = audio_track.get();
+    }else{
+        auto result_or_error = m_peer_connection_->AddTrack(mAudioTrack, {kStreamId});
+        if (!result_or_error.ok()) {
+            qDebug() << "Failed to add audio track to PeerConnection: "
+                            << result_or_error.error().message();
+        }
+    }
+
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " m_peer_connection_ AddTrack" + kAudioLabel).toStdString());
+    if(mVideoTrack == nullptr){
+        rtc::scoped_refptr<MyCapturer> video_device = new rtc::RefCountedObject<MyCapturer>();
+        if (video_device) {
+            video_device->startCapturer();
+            rtc::scoped_refptr<webrtc::VideoTrackInterface> video_track_(
+                m_peer_connection_factory_->CreateVideoTrack(kVideoLabel, video_device));
+            qDebug()<<"local track is "<<video_track_->id().c_str();
+            auto result_or_error = m_peer_connection_->AddTrack(video_track_, { kStreamId });
+            mVideoTrack = video_track_.get();
+            video_track_->AddRef();
+            if (!result_or_error.ok()) {
+                qDebug() << "Failed to add video track to PeerConnection: "
+                    << result_or_error.error().message();
+            }
+            gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                         " m_peer_connection_ AddTrack" + kVideoLabel).toStdString());
+        } else {
+            qDebug()<< "OpenVideoCaptureDevice failed";
+        }
+    }else{
+        auto result_or_error = m_peer_connection_->AddTrack(mVideoTrack, { kStreamId });
+        if (!result_or_error.ok()) {
+            qDebug() << "Failed to add video track to PeerConnection: "
+                << result_or_error.error().message();
+        }
+        gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                     " m_peer_connection_ AddTrack" + kVideoLabel).toStdString());
+    }
+
+}
+
 WebrtcHanlder::~WebrtcHanlder()
 {
 
@@ -458,8 +486,12 @@ void MainWindow::itemClicked(QModelIndex index)
 {
     if(!mSignalClient->Connected()){
         qDebug()<<"请先连接信令服务";
+        return;
     }
+    mHandler->InitWebrtc();
+    this->mLocalVideoTrack = mHandler->VideoTrack();
     qDebug()<<mModel->item(index.row())->text();
+
     mRemoteName = mModel->item(index.row())->text();
     if(mRemoteName == this->mPeerName){
         return;
diff --git a/client/webrtc_demo/src/mainwindow.h b/client/webrtc_demo/src/mainwindow.h
index af68149..10568d8 100644
--- a/client/webrtc_demo/src/mainwindow.h
+++ b/client/webrtc_demo/src/mainwindow.h
@@ -110,6 +110,9 @@ public:
     void SetRemoteCandidate(QString);
     void CreateAnwer();
     webrtc::VideoTrackInterface *VideoTrack();
+    void AddLocalTrack();
+
+
 protected:
     ~WebrtcHanlder();
     //
@@ -142,6 +145,7 @@ private:
     SignalClient *mClient;
     QString mRemoteName;
     webrtc::VideoTrackInterface *mVideoTrack;
+    webrtc::AudioTrackInterface *mAudioTrack;
 };
 
 class MainWindow :public QMainWindow