diff --git a/src/device/DeviceManager.cpp b/src/device/DeviceManager.cpp
index 09844f9..f404530 100644
--- a/src/device/DeviceManager.cpp
+++ b/src/device/DeviceManager.cpp
@@ -135,9 +135,11 @@ void DeviceManager::initDevice() {
     previewDataCaller = QThread::create([=](){
         while (!endLoop)
         {
-            qDebug()<<"Preview data reader sleep!";
-            QThread::msleep(500);
-            if (!previewing) continue;
+            if (!previewing) {
+                qDebug()<<"Preview data reader long sleep!";
+                QThread::sleep(3);
+                continue;
+            }
             qDebug()<<"GetStatus";
             StatusInfo inf = GetStatus();
             qDebug() << "GetPreviewData request status, status:" << getStatusString(inf.status);
@@ -147,11 +149,16 @@ void DeviceManager::initDevice() {
                 if (!data)continue;
                 qDebug() << "Preview data reader read end!";
                 QByteArray bytes = QByteArray::fromRawData(data, 140 * 140);
-                if (!previewing) continue;
+                if (!previewing) {
+                    qDebug()<<"Preview data reader long sleep!";
+                    QThread::sleep(3);
+                    continue;
+                }
                 qDebug() << "Preview data response event start!";
                 TRIGGER_EVENT(GUIEvents::ResponsePreviewData, nullptr, (QObject *) (&bytes));
                 qDebug() << "Preview data response event end!";
             }
+            QThread::msleep(100);
         }
     });
     previewDataCaller->start();