diff --git a/client/webrtc_demo/src/MyCapturer.cpp b/client/webrtc_demo/src/MyCapturer.cpp
index 8e30f44..e362a45 100644
--- a/client/webrtc_demo/src/MyCapturer.cpp
+++ b/client/webrtc_demo/src/MyCapturer.cpp
@@ -3,6 +3,7 @@
 #include <modules/desktop_capture/desktop_capture_options.h>
 #include <QDebug>
 #include <iostream>
+#include "easylog.h"
 
 MyCapturer::MyCapturer() {
 
diff --git a/client/webrtc_demo/src/easylog.cpp b/client/webrtc_demo/src/easylog.cpp
new file mode 100644
index 0000000..e37d30c
--- /dev/null
+++ b/client/webrtc_demo/src/easylog.cpp
@@ -0,0 +1,31 @@
+#include "easylog.h"
+
+EasyLog *gLog(){
+    static EasyLog *gsLog ;
+    if (gsLog == nullptr)
+        gsLog = new EasyLog("d://peerconection.txt");
+    return gsLog;
+}
+
+EasyLog::EasyLog(std::string path):
+    mFile(nullptr)
+{
+    mFile = fopen(path.c_str(),"w+");
+    if(mFile == nullptr){
+        qDebug()<<"easylog";
+    }
+}
+
+int EasyLog::Log(std::string data)
+{
+    std::unique_lock<std::mutex> mutex(mMux);
+    if((mFile == nullptr)){
+        return -1;
+    }
+    int ret = fwrite(data.c_str(),data.size(),1,mFile);
+    fwrite("\r\n",2,1,mFile);
+
+    fflush(mFile);
+    return ret;
+};
+
diff --git a/client/webrtc_demo/src/easylog.h b/client/webrtc_demo/src/easylog.h
new file mode 100644
index 0000000..49ccccb
--- /dev/null
+++ b/client/webrtc_demo/src/easylog.h
@@ -0,0 +1,18 @@
+#ifndef EASYLOG_H
+#define EASYLOG_H
+#include <stdio.h>
+#include <string>
+#include <QDebug>
+#include <mutex>
+class EasyLog
+{
+public:
+    EasyLog(std::string path);
+    int Log(std::string data);
+    FILE *mFile;
+    std::mutex mMux;
+};
+
+EasyLog *gLog();
+
+#endif // EASYLOG_H
diff --git a/client/webrtc_demo/src/main.cpp b/client/webrtc_demo/src/main.cpp
index 7684990..786bbbd 100644
--- a/client/webrtc_demo/src/main.cpp
+++ b/client/webrtc_demo/src/main.cpp
@@ -1,7 +1,6 @@
 #include "mainwindow.h"
-
+#include "easylog.h"
 #include <QApplication>
-
 #include "modules/video_capture/video_capture.h"
 #include "video_capturer_test.h"
 #include <QString>
@@ -66,6 +65,7 @@ BOOLEAN WINAPI SystemFunction036(PVOID, ULONG);
 #pragma comment(lib, "dxgi.lib")
 #pragma comment(lib, "Gdi32.lib")
 
+
 void EnumCapture()
 {
     std::unique_ptr<webrtc::VideoCaptureModule::DeviceInfo> info(
diff --git a/client/webrtc_demo/src/mainwindow.cpp b/client/webrtc_demo/src/mainwindow.cpp
index 297b077..025daed 100644
--- a/client/webrtc_demo/src/mainwindow.cpp
+++ b/client/webrtc_demo/src/mainwindow.cpp
@@ -10,13 +10,47 @@
 #include "video_capture.h"
 #include "video_capturer_test.h"
 #include <iostream>
-
+#include "easylog.h"
 
 const char kCandidateSdpMidName[] = "sdpMid";
 const char kCandidateSdpMlineIndexName[] = "sdpMLineIndex";
 const char kCandidateSdpName[] = "candidate";
 
 
+QString IceGatheringStateName(webrtc::PeerConnectionInterface::IceGatheringState w){
+    switch (w) {
+    case webrtc::PeerConnectionInterface::IceGatheringState::kIceGatheringNew:
+        return "kIceGatheringNew";
+    case webrtc::PeerConnectionInterface::IceGatheringState::kIceGatheringGathering:
+        return "kIceGatheringGathering";
+    case webrtc::PeerConnectionInterface::IceGatheringState::kIceGatheringComplete:
+        return "kIceGatheringComplete";
+    }
+
+}
+
+QString IceConnectionStateName(webrtc::PeerConnectionInterface::IceConnectionState w){
+    switch(w){
+    case webrtc::PeerConnectionInterface::IceConnectionState::kIceConnectionNew:
+        return "kIceConnectionNew";
+    case webrtc::PeerConnectionInterface::IceConnectionState::kIceConnectionChecking:
+        return "kIceConnectionChecking";
+    case webrtc::PeerConnectionInterface::IceConnectionState::kIceConnectionConnected:
+        return "kIceConnectionConnected";
+    case webrtc::PeerConnectionInterface::IceConnectionState::kIceConnectionCompleted:
+        return "kIceConnectionCompleted";
+    case webrtc::PeerConnectionInterface::IceConnectionState::kIceConnectionFailed:
+        return "kIceConnectionFailed";
+    case webrtc::PeerConnectionInterface::IceConnectionState::kIceConnectionDisconnected:
+        return "kIceConnectionDisconnected";
+    case webrtc::PeerConnectionInterface::IceConnectionState::kIceConnectionClosed:
+        return "kIceConnectionClosed";
+    case webrtc::PeerConnectionInterface::IceConnectionState::kIceConnectionMax:
+        return "kIceConnectionMax";
+    }
+}
+
+
 MainWindow::MainWindow(QWidget *parent)
     : QMainWindow(parent)
     , ui(new Ui::MainWindow)
@@ -102,8 +136,8 @@ int WebrtcHanlder::InitWebrtc()
         qDebug() << "Failed to add audio track to PeerConnection: "
                         << result_or_error.error().message();
     }
-    //rtc::scoped_refptr<CapturerTrackSource> video_device =
-    //    CapturerTrackSource::Create();
+    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();
@@ -115,47 +149,14 @@ int WebrtcHanlder::InitWebrtc()
             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";
     }
 }
 
 
-int WebrtcHanlder::AddTrack()
-{
-    if (!m_peer_connection_->GetSenders().empty()) {
-        return -1;  // Already added tracks.
-    }
-    // add audio tracks
-    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()) {
-    RTC_LOG(LS_ERROR) << "Failed to add audio track to PeerConnection: "
-                        << result_or_error.error().message();
-    }
-    //rtc::scoped_refptr<CapturerTrackSource> video_device =
-    //    CapturerTrackSource::Create();
-    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));
-
-        result_or_error = m_peer_connection_->AddTrack(video_track_, { kStreamId });
-        if (!result_or_error.ok()) {
-            RTC_LOG(LS_ERROR) << "Failed to add video track to PeerConnection: "
-                << result_or_error.error().message();
-        }
-    } else {
-        RTC_LOG(LS_ERROR) << "OpenVideoCaptureDevice failed";
-    }
-    webrtc::DataChannelInit config;
-}
-
 void WebrtcHanlder::SetSignalClient(SignalClient * cli)
 {
     this->mClient = cli;
@@ -168,6 +169,8 @@ void WebrtcHanlder::CreateOffer()
         m_peer_connection_->CreateOffer(this,
             webrtc::PeerConnectionInterface::RTCOfferAnswerOptions());
     }
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " CreateOffer").toStdString());
 }
 
 class DummySetSessionDescriptionObserver
@@ -211,6 +214,9 @@ void WebrtcHanlder::SetRemoteSdp(QString sdp)
                     DummySetSessionDescriptionObserver::Create(),
                     session_description.release());;
     }
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " SetRemoteSdp " + type + ": " +
+                 ssdp).toStdString());
 }
 
 
@@ -232,6 +238,9 @@ void WebrtcHanlder::SetRemoteCandidate(QString sdp)
     if(nullptr != m_peer_connection_){
         m_peer_connection_->AddIceCandidate(candidate.get());
     }
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " SetRemoteCandidate&&CreateIceCandidate "  + ": " +
+                 ssdp).toStdString());
 }
 
 void WebrtcHanlder::CreateAnwer()
@@ -239,6 +248,8 @@ void WebrtcHanlder::CreateAnwer()
     qDebug()<<"create answer";
     m_peer_connection_->CreateAnswer(
         this, webrtc::PeerConnectionInterface::RTCOfferAnswerOptions());
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " CreateAnswer ").toStdString());
 }
 
 WebrtcHanlder::~WebrtcHanlder()
@@ -253,25 +264,38 @@ void WebrtcHanlder::OnSignalingChange(webrtc::PeerConnectionInterface::Signaling
 void WebrtcHanlder::OnAddTrack(rtc::scoped_refptr<webrtc::RtpReceiverInterface> receiver, const std::vector<rtc::scoped_refptr<webrtc::MediaStreamInterface> > &streams)
 {
     qDebug()<<"OnAddTrack"<<receiver->id().c_str();
-    if (receiver->track().release()->kind() == webrtc::MediaStreamTrackInterface::kVideoKind)
+    if (receiver->track().release()->kind() ==
+            webrtc::MediaStreamTrackInterface::kVideoKind)
         OnRemoteTrack(receiver->track().release());
+
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " OnAddTrack ").toStdString());
 }
 
 void WebrtcHanlder::OnRemoveTrack(rtc::scoped_refptr<webrtc::RtpReceiverInterface> receiver)
 {
     qDebug()<<"OnRemoveTrack";
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " OnRemoveTrack ").toStdString());
 }
 
 void WebrtcHanlder::OnDataChannel(rtc::scoped_refptr<webrtc::DataChannelInterface> channel) {
-    qDebug()<<"OnRemoveTrack";
+    qDebug()<<"OnDataChannel";
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " OnDataChannel ").toStdString());
 }
 
 void WebrtcHanlder::OnIceConnectionChange(webrtc::PeerConnectionInterface::IceConnectionState new_state) {
     qDebug()<<"OnIceConnectionChange"<<new_state;
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " OnIceConnectionChange " +
+                 IceConnectionStateName(new_state)).toStdString());
 }
 
 void WebrtcHanlder::OnIceGatheringChange(webrtc::PeerConnectionInterface::IceGatheringState new_state) {
-
+    qDebug()<<"OnIceGatheringChange"<<new_state;
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " OnIceGatheringChange " + IceGatheringStateName(new_state)).toStdString());
 }
 
 void WebrtcHanlder::OnIceCandidate(const webrtc::IceCandidateInterface *candidate)
@@ -289,10 +313,14 @@ void WebrtcHanlder::OnIceCandidate(const webrtc::IceCandidateInterface *candidat
     addr.insert(kCandidateSdpName,sdp.c_str());
     qDebug()<<"condidate:\r\n"<< QString(QJsonDocument(addr).toJson());
     this->mClient->SendICECandidate(mRemoteName,QString(QJsonDocument(addr).toJson()));
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " OnIceCandidate " + QString(QJsonDocument(addr).toJson())).toStdString());
 }
 
 void WebrtcHanlder::OnIceConnectionReceivingChange(bool receiving) {
-
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " OnIceConnectionReceivingChange " +\
+                 QString::asprintf("%d",receiving)).toStdString());
 }
 
 
@@ -316,11 +344,15 @@ void WebrtcHanlder::OnSuccess(webrtc::SessionDescriptionInterface *desc)
     if(QString(desc->type().c_str()) == "answer"){
         OnOfferSdp(QJsonDocument(addr).toJson());
     }
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 "PeerConnectionObserver::OnSuccess " + QJsonDocument(addr).toJson()).toStdString());
 }
 
 void WebrtcHanlder::OnFailure(webrtc::RTCError error)
 {
     qDebug()<<error.message();
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 "PeerConnectionObserver::OnSuccess " + error.message()).toStdString());
 }
 
 
diff --git a/client/webrtc_demo/src/mainwindow.h b/client/webrtc_demo/src/mainwindow.h
index 1869a73..01c3172 100644
--- a/client/webrtc_demo/src/mainwindow.h
+++ b/client/webrtc_demo/src/mainwindow.h
@@ -93,14 +93,12 @@ class WebrtcHanlder :public QObject,
         public webrtc::PeerConnectionObserver,
         public webrtc::CreateSessionDescriptionObserver{
     Q_OBJECT
-
 signals:
     void OnOfferSdp(QString);
     void OnRemoteTrack(webrtc::MediaStreamTrackInterface*);
 
 public:
     int InitWebrtc();
-    int AddTrack();
     void SetSignalClient(SignalClient *);
     void CreateOffer();
     void CreateAnswer();
diff --git a/client/webrtc_demo/src/signal_client.cpp b/client/webrtc_demo/src/signal_client.cpp
index 814800b..fac3d65 100644
--- a/client/webrtc_demo/src/signal_client.cpp
+++ b/client/webrtc_demo/src/signal_client.cpp
@@ -2,6 +2,7 @@
 #include <QJsonDocument>
 #include <windows.h>
 #include <Lmcons.h>
+#include "easylog.h"
 
 SignalClient::SignalClient(const QUrl &url, bool debug, QObject *parent):
     QObject(parent),
@@ -39,6 +40,9 @@ void SignalClient::SendLogin()
     obj.insert("data",data);
     m_peer_name = QString::fromWCharArray(username);
     m_webSocket.sendTextMessage(QJsonDocument(obj).toJson());
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +"  send:\r\n" +
+              QString(QJsonDocument(obj).toJson())).toStdString());
+
 }
 
 #define REQ_INROOM 1001
@@ -52,6 +56,8 @@ void SignalClient::SendInRoom(QString room)
     obj.insert("type",REQ_INROOM);
     obj.insert("data",data);
     m_webSocket.sendTextMessage(QString(QJsonDocument(obj).toJson()));
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +"  send:\r\n" +
+              QString(QJsonDocument(obj).toJson())).toStdString());
 }
 
 #define REQ_INROOM 1004
@@ -64,6 +70,8 @@ void SignalClient::SendListRoom(QString room)
     obj.insert("type",REQ_INROOM);
     obj.insert("data",data);
     m_webSocket.sendTextMessage(QString(QJsonDocument(obj).toJson()));
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +"  send:\r\n" +
+              QString(QJsonDocument(obj).toJson())).toStdString());
 }
 
 bool SignalClient::Connected()
@@ -89,7 +97,8 @@ void SignalClient::SendSDPOffer(QString peer, QString sdp)
     qDebug()<<QString(QJsonDocument(obj).toJson());
     m_webSocket.sendTextMessage(QString(QJsonDocument(obj).toJson()));
 
-    qDebug()<<QString(QJsonDocument(obj).toJson());
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +"  send:\r\n" +
+              QString(QJsonDocument(obj).toJson())).toStdString());
 }
 #define REQ_CANDIDATE 1006
 void SignalClient::SendICECandidate(QString peer, QString candidate)
@@ -103,6 +112,8 @@ void SignalClient::SendICECandidate(QString peer, QString candidate)
     obj.insert("data",data);
     qDebug()<<QString(QJsonDocument(obj).toJson());
     m_webSocket.sendTextMessage(QString(QJsonDocument(obj).toJson()));
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +"  send:\r\n" +
+              QString(QJsonDocument(obj).toJson())).toStdString());
 }
 
 QString SignalClient::PeerName()
@@ -118,6 +129,8 @@ void SignalClient::onConnected()
     m_connected = true;
     m_timer.stop();
     connected();
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +" +"
+            " WebSocket connected").toStdString());
 }
 
 void SignalClient::onUnConnected()
@@ -127,6 +140,9 @@ void SignalClient::onUnConnected()
     m_timer.setSingleShot(false);
     m_webSocket.open(QUrl(m_url));
     closed();
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) +
+                 " WebSocket unconnected").toStdString());
+
 }
 
 void SignalClient::onTextMessageReceived(QString message)
@@ -135,11 +151,16 @@ void SignalClient::onTextMessageReceived(QString message)
     auto obj = QJsonDocument::fromJson(message.toUtf8()).object();
     qDebug()<<obj["type"];
     response(obj["type"].toInt(),obj["data"].toObject());
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__) + "  recv:\r\n" +
+              QString(QJsonDocument(obj).toJson())).toStdString());
 }
 
 void SignalClient::onSocketError(QAbstractSocket::SocketError error)
 {
     qDebug()<<error;
+    gLog()->Log((QString::asprintf("%s %d",__FILE__,__LINE__)   +
+                 " WebSocket unconnected").toStdString());
+
 }
 
 void SignalClient::onReconenectTimeout()
diff --git a/client/webrtc_demo/src/video_capture.h b/client/webrtc_demo/src/video_capture.h
index 58c4418..9016a53 100644
--- a/client/webrtc_demo/src/video_capture.h
+++ b/client/webrtc_demo/src/video_capture.h
@@ -2,7 +2,7 @@
 #define VIDEO_CAPTURE_H
 
 // vcm_capturer_test.h
-
+#include "easylog.h"
 
 #include <memory>
 #include <QObject>
diff --git a/client/webrtc_demo/webrtc_demo.pro b/client/webrtc_demo/webrtc_demo.pro
index 7b3a0fc..1697823 100644
--- a/client/webrtc_demo/webrtc_demo.pro
+++ b/client/webrtc_demo/webrtc_demo.pro
@@ -23,6 +23,7 @@ LIBS += -L$$PWD/third/lib libwebrtc.lib  ole32.lib oleaut32.lib strmiids.lib yuv
 SOURCES += \
     src/MyCapturer.cpp \
     src/cplaywidget.cpp \
+    src/easylog.cpp \
     src/main.cpp \
     src/mainwindow.cpp \
     src/signal_client.cpp \
@@ -32,6 +33,7 @@ SOURCES += \
 HEADERS += \
     src/MyCapturer.h \
     src/cplaywidget.h \
+    src/easylog.h \
     src/mainwindow.h \
     src/signal_client.h \
     src/video_capture.h \