diff --git a/mainwindow.cpp b/mainwindow.cpp
index 2a5da37..4411803 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -9,6 +9,8 @@ MainWindow::MainWindow(QWidget *parent) :
     ui->setupUi(this);
     ui->stackedWidgetExtraInfo->hide();
 
+    connect(ui->menu_System, SIGNAL(click()), this, SLOT(switchPage()), Qt::QueuedConnection);
+
     connect(ui->tableViewStocks, SIGNAL(stockActivated(Stock*)), this, SLOT(stockActivated(Stock*)));
     connect(ui->tableViewStocks, SIGNAL(stockSelected(Stock*)), this, SLOT(stockSelected(Stock*)));
 
@@ -64,7 +66,15 @@ MainWindow::~MainWindow()
 void MainWindow::closeEvent(QCloseEvent *event){
     event->accept();
 }
-
+void MainWindow::keyPressEvent(QKeyEvent* e)
+{
+    switch (e->key())
+    {
+      case Qt::Key_Enter:
+        switchPage();
+        break;
+    }
+}
 void MainWindow::updateRealTimeQuoteData(const RealTimeQuoteData &data){
 
     Stock *stock = m_dataManager->stock(data.code);
@@ -209,3 +219,21 @@ void MainWindow::on_actionAbout_triggered(){
 
 
 
+
+void MainWindow::on_actionback_triggered()
+{
+    switchPage();
+    /*
+    int nCount = ui->stackedWidget->count();
+    int nIndex = ui->stackedWidget->currentIndex();
+
+    // 获取下一个需要显示的页面索引
+    ++nIndex;
+
+    // 当需要显示的页面索引大于等于总页面时，切换至首页
+    if (nIndex >= nCount)
+        nIndex = 0;
+
+    ui->stackedWidget->setCurrentIndex(nIndex);
+    */
+}
diff --git a/mainwindow.h b/mainwindow.h
index 04ad837..c5c10c4 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -28,6 +28,8 @@ class MainWindow : public QMainWindow
 protected:
     void closeEvent(QCloseEvent *event);
 
+private slots:
+    void keyPressEvent(QKeyEvent* event);
 
  public slots:
     void updateRealTimeQuoteData(const RealTimeQuoteData &data);
@@ -48,6 +50,8 @@ private slots:
 
 
 
+    void on_actionback_triggered();
+
 private:
     Ui::MainWindow *ui;
 
diff --git a/mainwindow.ui b/mainwindow.ui
index fd9a82c..0f803fd 100644
--- a/mainwindow.ui
+++ b/mainwindow.ui
@@ -325,7 +325,7 @@
               </widget>
               <widget class="QStackedWidget" name="stackedWidgetExtraInfo">
                <property name="currentIndex">
-                <number>0</number>
+                <number>1</number>
                </property>
                <widget class="QWidget" name="page_3">
                 <layout class="QVBoxLayout" name="verticalLayout_2"/>
@@ -758,13 +758,14 @@
      <x>0</x>
      <y>0</y>
      <width>941</width>
-     <height>23</height>
+     <height>26</height>
     </rect>
    </property>
    <widget class="QMenu" name="menu_System">
     <property name="title">
      <string>&amp;System</string>
     </property>
+    <addaction name="actionback"/>
     <addaction name="actionQuit"/>
    </widget>
    <widget class="QMenu" name="menu_About">
@@ -787,6 +788,11 @@
     <string>&amp;About</string>
    </property>
   </action>
+  <action name="actionback">
+   <property name="text">
+    <string>back</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>
diff --git a/stock.h b/stock.h
index 80348ee..37c2d9b 100644
--- a/stock.h
+++ b/stock.h
@@ -2,7 +2,7 @@
 #define STOCK_H
 
 #include <QObject>
-
+#include <QMutex>
 #include "common.h"