diff --git a/app/gui/oven_control/configmastervolumedlg.cpp b/app/gui/oven_control/configmastervolumedlg.cpp
index c5e2dec..86206e3 100644
--- a/app/gui/oven_control/configmastervolumedlg.cpp
+++ b/app/gui/oven_control/configmastervolumedlg.cpp
@@ -17,7 +17,7 @@ ConfigMasterVolumeDlg::ConfigMasterVolumeDlg(QWidget *parent) :
     this->setAttribute( Qt::WA_DeleteOnClose);
 
     item = cfg->getConfigValue(config_marster_vol);
-    m_nCurMasterVol = item.d32;
+    m_nPrevMasterVol = m_nCurMasterVol = item.d32;
     ui->ctrProgressLight->setMaxProgress(m_nCurMasterVol,MAX_MASTER_VOL);
 }
 
@@ -28,26 +28,34 @@ ConfigMasterVolumeDlg::~ConfigMasterVolumeDlg()
 
 void ConfigMasterVolumeDlg::on_ctrBtnOk_clicked()
 {
-    Config* cfg = Config::getInstance();
-    config_item item;
-    item.d32 = m_nCurMasterVol;
-    cfg->setConfigValue(config_marster_vol,item);
     accept();
 }
 
 void ConfigMasterVolumeDlg::on_ctrBtnCancel_clicked()
 {
+    Config* cfg = Config::getInstance();
+    config_item item;
+    item.d32 = m_nPrevMasterVol;
+    cfg->setConfigValue(config_marster_vol,item);
     reject();
 }
 
 void ConfigMasterVolumeDlg::on_ctrBtnMinus_clicked()
 {
+    Config* cfg = Config::getInstance();
+    config_item item;
     m_nCurMasterVol = m_nCurMasterVol > 0?m_nCurMasterVol-1:0;
+    item.d32 = m_nCurMasterVol;
+    cfg->setConfigValue(config_marster_vol,item);
     ui->ctrProgressLight->setCurrentProgress(m_nCurMasterVol);
 }
 
 void ConfigMasterVolumeDlg::on_ctrBtnPlus_clicked()
 {
+    Config* cfg = Config::getInstance();
+    config_item item;
     m_nCurMasterVol = m_nCurMasterVol<MAX_MASTER_VOL?m_nCurMasterVol+1:MAX_MASTER_VOL;
+    item.d32 = m_nCurMasterVol;
+    cfg->setConfigValue(config_marster_vol,item);
     ui->ctrProgressLight->setCurrentProgress(m_nCurMasterVol);
 }
diff --git a/app/gui/oven_control/configmastervolumedlg.h b/app/gui/oven_control/configmastervolumedlg.h
index 6be6244..29959b0 100644
--- a/app/gui/oven_control/configmastervolumedlg.h
+++ b/app/gui/oven_control/configmastervolumedlg.h
@@ -27,6 +27,7 @@ private slots:
 private:
     Ui::ConfigMasterVolumeDlg *ui;
     int m_nCurMasterVol;
+    int m_nPrevMasterVol;
 };
 
 #endif // CONFIGMASTERVOLUMEDLG_H