diff --git a/src/forms/scan/ScanFormWidget.cpp b/src/forms/scan/ScanFormWidget.cpp
index c3c5546..4e0233c 100644
--- a/src/forms/scan/ScanFormWidget.cpp
+++ b/src/forms/scan/ScanFormWidget.cpp
@@ -205,6 +205,11 @@ void ScanFormWidget::initScanControlBar(QHBoxLayout *layout){
     });
     connect(mBtnDrainage, &QToolButton::clicked, [=](bool aSatus) {
         //Drainage
+        if(aSatus && DialogManager::Default()->requestAlertMessage(tr("Make sure to open the drain valve ?"), DialogButtonMode::OkAndCancel, tr("Confirm Drainage")) == QDialog::Rejected)
+        {
+            mBtnDrainage->setChecked(!aSatus);
+            return;
+        }
         mBtnDrainage->setEnabled(false);
         if(aSatus == true)
         {