diff --git a/Src/GDDC/gddcdlg.cpp b/Src/GDDC/gddcdlg.cpp
index bfd8a67..1b35fdc 100644
--- a/Src/GDDC/gddcdlg.cpp
+++ b/Src/GDDC/gddcdlg.cpp
@@ -313,7 +313,7 @@ void GDDCdlg::mouseMoveEvent(QMouseEvent *event) {
         qDebug() << "x:" << diff.x() <<"y:" <<diff.y();
         m_GDDCCmdDlg->setMoveParm(diff);
 
-        if(diff.x() > 5 || diff.y() >5)//像素点超过5ptx才算移动，否则为跟踪
+        if(qAbs(diff.x()) > 5 || qAbs(diff.y()) >5)//像素点超过5ptx才算移动，否则为跟踪
         {
             _moveFlag = true;
             firstLocation->move((_dragStartPositon - QPoint(firstLocation->width()/2, firstLocation->height()/2)).toPoint());