diff --git a/src/SelectFormWidget.cpp b/src/SelectFormWidget.cpp
index babfb77..4dbce43 100644
--- a/src/SelectFormWidget.cpp
+++ b/src/SelectFormWidget.cpp
@@ -167,6 +167,19 @@ SelectFormWidget::SelectFormWidget(QWidget *parent) :
         if (currentRow<0)return;
         EventCenter::Default()->triggerEvent(GUIEvents::PatientSelected, nullptr,edit_patient->getPatientInformation()->Copy());
     });
+    connect(EventCenter::Default(),&EventCenter::ResponsePreview,[=](QObject* sender,QObject* data){
+        btnSelect->setEnabled(false);
+        btnDelete->setEnabled(false);
+        btnEdit->setEnabled(false);
+        btnAdd->setEnabled(false);
+    });
+    connect(EventCenter::Default(),&EventCenter::ResponseStop,[=](QObject* sender,QObject* data){
+        btnSelect->setEnabled(true);
+        btnDelete->setEnabled(true);
+        btnEdit->setEnabled(true);
+        btnAdd->setEnabled(true);
+    });
+
 }
 
 SelectFormWidget::~SelectFormWidget()
diff --git a/src/device/DeviceManager.cpp b/src/device/DeviceManager.cpp
index 45867d5..7558831 100644
--- a/src/device/DeviceManager.cpp
+++ b/src/device/DeviceManager.cpp
@@ -6,6 +6,8 @@
 #include "../event/EventCenter.h"
 #include <QVariant>
 #include <QTimerEvent>
+#include <QDate>
+#include <QDateTime>
 #include <qdebug.h>
 
 #define TRIGGER_EVENT EventCenter::Default()->triggerEvent
@@ -37,6 +39,7 @@ std::string getJsonFromPatInf(QObject* obj)
 
 void ErrorCallback(const char * msg)
 {
+    DeviceManager::Default()->setErrorOccurred(true);
     printf("Error Callback , message:%s\r\n", msg);
     QString m(msg);
     THROW_ERROR(m);
@@ -48,10 +51,7 @@ void DeviceManager::initDevice() {
     InitLib(ErrorCallback);
 
     deviceInfTimerID = startTimer(1000);
-    // global error flag
-    connect(EventCenter::Default(),&EventCenter::GUIErrorRaise,[=](QObject* sender, QObject* detail){
-        this->errorOccured = true;
-    });
+
     // empty scan
     connect(EventCenter::Default(),&EventCenter::RequestEmptyScan,[=](QObject* sender, QObject* detail){
         std::string json= getJsonFromPatInf(detail);
@@ -87,13 +87,21 @@ void DeviceManager::initDevice() {
                 qDebug()<<"Error thrown!";
                 lastStatus = -1;
                 previewing = false;
+                QString s("%1  %2");
+                s = s.arg(QDateTime::currentDateTime().toString("yyyy/MM/dd HH:mm:ss"), msg);
+                TRIGGER_EVENT(GUIEvents::GlobalBannerMessage, nullptr,(QObject*)&msg);
                 return;
             }
             lastStatus = -1;
             previewing = false;
+            QString s("%1  %2");
+            s = s.arg(QDateTime::currentDateTime().toString("yyyy/MM/dd HH:mm:ss"),("Scan Stopped!"));
+            TRIGGER_EVENT(GUIEvents::GlobalBannerMessage, nullptr,(QObject*)&s);
         }
+
         TRIGGER_EVENT(GUIEvents::InvokeOperationEnd, nullptr, nullptr);
         TRIGGER_EVENT(GUIEvents::ResponseStop, nullptr, nullptr);
+
     });
     // preview
     connect(EventCenter::Default(),&EventCenter::RequestPreviewScan,[=](){
@@ -113,6 +121,8 @@ void DeviceManager::initDevice() {
 //                timerID = startTimer(500);
                 TRIGGER_EVENT(GUIEvents::ResponsePreview, nullptr, nullptr);
                 TRIGGER_EVENT(GUIEvents::InvokeOperationEnd, nullptr, nullptr);
+                QString s("Device Previewing!");
+                TRIGGER_EVENT(GUIEvents::GlobalBannerMessage, nullptr, (QObject*)&s);
                 return;
             }
         }
@@ -154,7 +164,7 @@ void DeviceManager::timerEvent(QTimerEvent *event) {
         qDebug()<<"GetStatus";
         StatusInfo inf = GetStatus();
         qDebug() << "Scanning request status, status:" << getStatusString(inf.status);
-        if (errorOccured)
+        if (errorOccurred)
         {
             qDebug() << "Error occurred, exit progress timer" << inf.progress;
             goto exitTimer;
@@ -172,6 +182,7 @@ void DeviceManager::timerEvent(QTimerEvent *event) {
             QVariant var(inf.progress);
             qDebug() << "Normal scan, invoke InvokeOperationProgress:" << inf.progress;
             TRIGGER_EVENT(GUIEvents::InvokeOperationProgress, nullptr, (QObject*)&var);
+            return;
         } else{
             //未发生错误并且，之前状态是扫描，代表正常扫描完成
             if (lastStatus == SCANNING)
@@ -182,14 +193,18 @@ void DeviceManager::timerEvent(QTimerEvent *event) {
                 TRIGGER_EVENT(GUIEvents::InvokeOperationEnd, nullptr, (QObject*)&var);
                 lastStatus = -1;
                 previewing = false;
+                QString s("%1  %2");
+                s = s.arg(QDateTime::currentDateTime().toString("yyyy/MM/dd HH:mm:ss")).arg("Scan finished");
+                TRIGGER_EVENT(GUIEvents::GlobalBannerMessage, nullptr,(QObject*)&s);
             }
-            return;
         }
         exitTimer:
+        qDebug() << "Scanning progress Timer exit";
         killTimer(timerID);
         timerID=-1;
         lastStatus = -1;
         previewing = false;
+        TRIGGER_EVENT(GUIEvents::GlobalBannerMessage, nullptr,nullptr);
         return;
     } else{
         QString temp = QString(GetDeviceInfo(MEAN_TEMPERATURE));
diff --git a/src/device/DeviceManager.h b/src/device/DeviceManager.h
index 6f82a45..b677c04 100644
--- a/src/device/DeviceManager.h
+++ b/src/device/DeviceManager.h
@@ -16,6 +16,12 @@ public:
         return &manager;
     }
     void initDevice();
+    void setErrorOccurred(bool v){
+        errorOccurred = v;
+    }
+    bool getErrorOccurred(){
+        return errorOccurred;
+    }
 
 protected:
     void timerEvent(QTimerEvent* event) override ;
@@ -27,7 +33,7 @@ private:
     int lastStatus=-1;
     bool previewing = false;
     bool endLoop = false;
-    bool errorOccured = false;
+    bool errorOccurred = false;
     QThread* previewDataCaller;
 };
 
diff --git a/src/event/EventCenter.h b/src/event/EventCenter.h
index 38018a9..b15635b 100644
--- a/src/event/EventCenter.h
+++ b/src/event/EventCenter.h
@@ -23,6 +23,7 @@ ADD_EVENT_VALUE(InvokeOperationStart)\
 ADD_EVENT_VALUE(InvokeOperationProgress)\
 ADD_EVENT_VALUE(InvokeOperationEnd)\
 ADD_EVENT_VALUE(PromptDialogOpen)\
+ADD_EVENT_VALUE(GlobalBannerMessage)\
 ADD_EVENT_VALUE(GUIErrorRaise)
 
 enum GUIEvents{
diff --git a/src/tabformwidget.cpp b/src/tabformwidget.cpp
index cd4f1de..f03feab 100644
--- a/src/tabformwidget.cpp
+++ b/src/tabformwidget.cpp
@@ -48,7 +48,15 @@ TabFormWidget::TabFormWidget(QWidget* parent) :
 		if (!msg) return;
 		QString* s = (QString*)msg;
 		lockIcon->setText(QString("%1%2").arg(*s).arg(tr("°C")));
-		});
+	});
+    connect(EventCenter::Default(), &EventCenter::GlobalBannerMessage, [=](QObject*, QObject* msg) {
+        if (!msg) {
+            ui->systemMsgBar->setText("");
+            return;
+        }
+        QString* s = (QString*)msg;
+        ui->systemMsgBar->setText(*s);
+    });
 }
 
 TabFormWidget::~TabFormWidget()