diff --git a/src/frontend/netdetails/creatnetpage.cpp b/src/frontend/netdetails/creatnetpage.cpp
index 1126f8f8..ba5d0f98 100644
--- a/src/frontend/netdetails/creatnetpage.cpp
+++ b/src/frontend/netdetails/creatnetpage.cpp
@@ -36,16 +36,12 @@ void CreatNetPage::initUI()
     ipv4addressEdit = new LineEdit(this);
     netMaskEdit = new LineEdit(this);
     gateWayEdit = new LineEdit(this);
-//    firstDnsEdit = new LineEdit(this);
-//    secondDnsEdit = new LineEdit(this);
 
     m_connNameLabel = new QLabel(this);
     m_configLabel = new QLabel(this);
     m_addressLabel = new QLabel(this);
     m_maskLabel = new QLabel(this);
     m_gateWayLabel = new QLabel(this);
-//    m_dnsLabel = new QLabel(this);
-//    m_secDnsLabel = new QLabel(this);
 
     // IP的正则格式限制
     QRegExp rx("\\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\b");
@@ -56,8 +52,6 @@ void CreatNetPage::initUI()
     m_addressLabel->setText(tr("Address"));
     m_maskLabel->setText(tr("Netmask"));
     m_gateWayLabel->setText(tr("Default Gateway"));
-//    m_dnsLabel->setText(tr("Prefs DNS"));
-//    m_secDnsLabel->setText(tr("Alternative DNS"));
 
     m_detailLayout = new QFormLayout(this);
     m_detailLayout->setContentsMargins(0, 0, 0, 0);
@@ -67,8 +61,6 @@ void CreatNetPage::initUI()
     m_detailLayout->addRow(m_addressLabel,ipv4addressEdit);
     m_detailLayout->addRow(m_maskLabel,netMaskEdit);
     m_detailLayout->addRow(m_gateWayLabel,gateWayEdit);
-//    m_detailLayout->addRow(m_dnsLabel,firstDnsEdit);
-//    m_detailLayout->addRow(m_secDnsLabel,secondDnsEdit);
     m_detailLayout->addRow(m_dnsWidget);
 
     ipv4ConfigCombox->addItem(tr("Auto(DHCP)"), AUTO_CONFIG); //"自动(DHCP)"
@@ -77,8 +69,6 @@ void CreatNetPage::initUI()
     ipv4addressEdit->setValidator(new QRegExpValidator(rx, this));
     gateWayEdit->setValidator(new QRegExpValidator(rx, this));
     netMaskEdit->setValidator(new QRegExpValidator(rx, this));
-//    firstDnsEdit->setValidator(new QRegExpValidator(rx, this));
-//    secondDnsEdit->setValidator(new QRegExpValidator(rx, this));
 }
 
 void CreatNetPage::initComponent() {
@@ -93,14 +83,6 @@ void CreatNetPage::initComponent() {
     connect(ipv4ConfigCombox, SIGNAL(currentIndexChanged(int)), this, SLOT(setEnableOfSaveBtn()));
     connect(netMaskEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
     connect(gateWayEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
-//    connect(firstDnsEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
-//    connect(secondDnsEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
-    connect(m_dnsWidget, &MultipleDnsWidget::dnsTextChanged, this, [=]() {
-        setCreatePageState(false);
-    });
-    connect(m_dnsWidget, &MultipleDnsWidget::dnsEditingFinished, this, [=]() {
-        setCreatePageState(true);
-    });
 }
 
 bool CreatNetPage::checkConnectBtnIsEnabled()
@@ -122,28 +104,6 @@ bool CreatNetPage::checkConnectBtnIsEnabled()
             qDebug() << "create ipv4 netMask empty or invalid";
             return false;
         }
-#if 0
-        if (gateWayEdit->text().isEmpty() || !getTextEditState(gateWayEdit->text())) {
-            qDebug() << "create ipv4 gateway empty or invalid";
-            return false;
-        }
-
-        if (firstDnsEdit->text().isEmpty() && !secondDnsEdit->text().isEmpty()) {
-            qDebug() << "create ipv4 dns sort invalid";
-            return false;
-        }
-
-        if (!getTextEditState(firstDnsEdit->text())) {
-            qDebug() << "create ipv4 first dns invalid";
-            return false;
-        }
-
-        if (!getTextEditState(secondDnsEdit->text())) {
-            qDebug() << "create ipv4 second dns invalid";
-            return false;
-        }
-#endif
-
     }
     return true;
 }
@@ -162,16 +122,12 @@ void CreatNetPage::setLineEnabled(bool check) {
     ipv4addressEdit->setEnabled(check);
     netMaskEdit->setEnabled(check);
     gateWayEdit->setEnabled(check);
-//    firstDnsEdit->setEnabled(check);
-//    secondDnsEdit->setEnabled(check);
     m_dnsWidget->setEditEnabled(check);
 
     if (!check) {
         ipv4addressEdit->clear();
         netMaskEdit->clear();
         gateWayEdit->clear();
-//        firstDnsEdit->clear();
-//        secondDnsEdit->clear();
 
         ipv4addressEdit->setPlaceholderText(" ");
         netMaskEdit->setPlaceholderText(" ");
@@ -210,20 +166,14 @@ void CreatNetPage::constructIpv4Info(KyConnectSetting &setting)
 
     QStringList dnsList;
     dnsList.clear();
-#if 0
-    if (!firstDnsEdit->text().isEmpty()) {
-        dnsList << firstDnsEdit->text();
-        if (!secondDnsEdit->text().isEmpty()) {
-            dnsList << secondDnsEdit->text();
-        }
-    }
-#endif
 
     QList<QHostAddress> ipv4dnsList;
     ipv4dnsList.clear();
     ipv4dnsList = m_dnsWidget->getDns();
     for (QHostAddress str: ipv4dnsList) {
-        dnsList << str.toString();
+        if (!dnsList.contains(str.toString())) {
+            dnsList << str.toString();
+        }
     }
 
     if (ipv4ConfigCombox->currentData() == AUTO_CONFIG) {
diff --git a/src/frontend/netdetails/creatnetpage.h b/src/frontend/netdetails/creatnetpage.h
index dff50df8..31885b3b 100644
--- a/src/frontend/netdetails/creatnetpage.h
+++ b/src/frontend/netdetails/creatnetpage.h
@@ -47,8 +47,6 @@ private:
     LineEdit *ipv4addressEdit;
     LineEdit *netMaskEdit;
     LineEdit *gateWayEdit;
-//    LineEdit *firstDnsEdit;
-//    LineEdit *secondDnsEdit;
 
     QFormLayout *m_detailLayout;
     QVBoxLayout *mvBoxLayout;
@@ -57,8 +55,6 @@ private:
     QLabel *m_addressLabel;
     QLabel *m_maskLabel;
     QLabel *m_gateWayLabel;
-//    QLabel *m_dnsLabel;
-//    QLabel *m_secDnsLabel;
     MultipleDnsWidget *m_dnsWidget = nullptr;
 
 private:
diff --git a/src/frontend/netdetails/ipv4page.cpp b/src/frontend/netdetails/ipv4page.cpp
index 63553223..8e0bae39 100644
--- a/src/frontend/netdetails/ipv4page.cpp
+++ b/src/frontend/netdetails/ipv4page.cpp
@@ -39,15 +39,11 @@ void Ipv4Page::initUI() {
     ipv4addressEdit = new LineEdit(this);
     netMaskEdit = new LineEdit(this);
     gateWayEdit = new LineEdit(this);
-//    firstDnsEdit = new LineEdit(this);
-//    secondDnsEdit = new LineEdit(this);
 
     m_configLabel = new QLabel(this);
     m_addressLabel = new QLabel(this);
     m_maskLabel = new QLabel(this);
     m_gateWayLabel = new QLabel(this);
-//    m_dnsLabel = new QLabel(this);
-//    m_secDnsLabel = new QLabel(this);
 
     m_configEmptyLabel = new QLabel(this);
     m_configEmptyLabel->setFixedHeight(LABEL_HEIGHT);
@@ -68,8 +64,6 @@ void Ipv4Page::initUI() {
     m_addressLabel->setText(tr("Address"));
     m_maskLabel->setText(tr("Netmask"));
     m_gateWayLabel->setText(tr("Default Gateway"));
-//    m_dnsLabel->setText(tr("Prefs DNS"));
-//    m_secDnsLabel->setText(tr("Alternative DNS"));
 
     m_statusLabel = new QLabel(this);
     m_statusLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
@@ -109,8 +103,6 @@ void Ipv4Page::initUI() {
     m_detailLayout->addRow(m_maskLabel,maskWidget);
     m_detailLayout->addRow(m_gateWayLabel,gateWayEdit);
     m_detailLayout->addRow(m_gateWayEmptyLabel);
-//    m_detailLayout->addRow(m_dnsLabel,firstDnsEdit);
-//    m_detailLayout->addRow(m_secDnsLabel,secondDnsEdit);
     m_detailLayout->addRow(m_dnsWidget);
 
     ipv4ConfigCombox->addItem(tr("Auto(DHCP)")); //"自动(DHCP)"
@@ -127,8 +119,6 @@ void Ipv4Page::initUI() {
     ipv4addressEdit->setValidator(new QRegExpValidator(rx, this));
     gateWayEdit->setValidator(new QRegExpValidator(rx, this));
     netMaskEdit->setValidator(new QRegExpValidator(rx, this));
-//    firstDnsEdit->setValidator(new QRegExpValidator(rx, this));
-//    secondDnsEdit->setValidator(new QRegExpValidator(rx, this));
 
     initLoadingIcon();
 }
@@ -149,14 +139,6 @@ void Ipv4Page::initComponent() {
     connect(ipv4addressEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
     connect(netMaskEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
     connect(gateWayEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
-//    connect(firstDnsEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
-//    connect(secondDnsEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
-    connect(m_dnsWidget, &MultipleDnsWidget::dnsTextChanged, this, [=]() {
-        setIpv4PageState(false);
-    });
-    connect(m_dnsWidget, &MultipleDnsWidget::dnsEditingFinished, this, [=]() {
-        setIpv4PageState(true);
-    });
 }
 
 void Ipv4Page::setIpv4Config(KyIpConfigType ipv4Config)
@@ -183,18 +165,6 @@ void Ipv4Page::setMulDns(const QList<QHostAddress> &dns)
     m_dnsWidget->setDnsListText(dns);
 }
 
-#if 0
-void Ipv4Page::setIpv4FirDns(const QString &ipv4FirDns)
-{
-    firstDnsEdit->setText(ipv4FirDns);
-}
-
-void Ipv4Page::setIpv4SecDns(const QString &ipv4SecDns)
-{
-    secondDnsEdit->setText(ipv4SecDns);
-}
-#endif
-
 void Ipv4Page::setGateWay(const QString &gateWay)
 {
     gateWayEdit->setText(gateWay);
@@ -231,24 +201,17 @@ bool Ipv4Page::checkIsChanged(const ConInfo info, KyConnectSetting &setting)
         if(info.strIPV4Address != ipv4addressEdit->text()
                 || info.strIPV4NetMask != /*netMaskEdit->text()*/getNetMaskText(netMaskEdit->text())
                 || info.strIPV4GateWay != gateWayEdit->text()
-//                || info.strIPV4FirDns  != firstDnsEdit->text()
-//                || info.strIPV4SecDns  != secondDnsEdit->text()
                 || info.ipv4DnsList != ipv4dnsList) {
 
             qDebug() << "ipv4 info changed";
             QStringList dnsList;
             dnsList.clear();
             for (QHostAddress str: ipv4dnsList) {
-                dnsList << str.toString();
-            }
-#if 0
-            if (!firstDnsEdit->text().isEmpty()) {
-                dnsList << firstDnsEdit->text();
-                if (!secondDnsEdit->text().isEmpty()) {
-                    dnsList << secondDnsEdit->text();
+                if (!dnsList.contains(str.toString())) {
+                    dnsList << str.toString();
                 }
             }
-#endif
+
             QString ipv4address =ipv4addressEdit->text();
             QString netMask = getNetMaskText(netMaskEdit->text());
             QString gateWay = gateWayEdit->text();
@@ -276,28 +239,6 @@ bool Ipv4Page::checkConnectBtnIsEnabled()
             qDebug() << "ipv4 netMask empty or invalid";
             return false;
         }
-
-//        if (gateWayEdit->text().isEmpty() || !getTextEditState(gateWayEdit->text())) {
-//            qDebug() << "ipv4 gateway empty or invalid";
-//            return false;
-//        }
-#if 0
-        if (firstDnsEdit->text().isEmpty() && !secondDnsEdit->text().isEmpty()) {
-            qDebug() << "ipv4 dns sort invalid";
-            return false;
-        }
-
-        if (!getTextEditState(firstDnsEdit->text())) {
-            qDebug() << "ipv4 first dns invalid";
-            return false;
-        }
-
-        if (!getTextEditState(secondDnsEdit->text())) {
-            qDebug() << "ipv4 second dns invalid";
-            return false;
-        }
-#endif
-
     }
     return true;
 }
@@ -347,8 +288,6 @@ void Ipv4Page::setLineEnabled(bool check) {
         ipv4addressEdit->clear();
         netMaskEdit->clear();
         gateWayEdit->clear();
-//        firstDnsEdit->clear();
-//        secondDnsEdit->clear();
 
         ipv4addressEdit->setPlaceholderText(" ");
         netMaskEdit->setPlaceholderText(" ");
@@ -361,8 +300,6 @@ void Ipv4Page::setLineEnabled(bool check) {
     ipv4addressEdit->setEnabled(check);
     netMaskEdit->setEnabled(check);
     gateWayEdit->setEnabled(check);
-//    firstDnsEdit->setEnabled(check);
-//    secondDnsEdit->setEnabled(check);
     m_dnsWidget->setEditEnabled(check);
 }
 
diff --git a/src/frontend/netdetails/ipv4page.h b/src/frontend/netdetails/ipv4page.h
index 134b4bef..f25148fd 100644
--- a/src/frontend/netdetails/ipv4page.h
+++ b/src/frontend/netdetails/ipv4page.h
@@ -43,8 +43,6 @@ public:
     void setIpv4Config(KyIpConfigType ipv4Config);
     void setIpv4(const QString &ipv4);
     void setNetMask(const QString &netMask);
-//    void setIpv4FirDns(const QString &ipv4FirDns);
-//    void setIpv4SecDns(const QString &ipv4SecDns);
     void setMulDns(const QList<QHostAddress> &dns);
     void setGateWay(const QString &gateWay);
 
@@ -59,8 +57,6 @@ private:
     LineEdit *ipv4addressEdit;
     LineEdit *netMaskEdit;
     LineEdit *gateWayEdit;
-//    LineEdit *firstDnsEdit;
-//    LineEdit *secondDnsEdit;
 
     QFormLayout *m_detailLayout;
     QVBoxLayout *mvBoxLayout;
@@ -68,8 +64,6 @@ private:
     QLabel *m_addressLabel;
     QLabel *m_maskLabel;
     QLabel *m_gateWayLabel;
-//    QLabel *m_dnsLabel;
-//    QLabel *m_secDnsLabel;
 
     QLabel *m_configEmptyLabel;
     QLabel *m_addressHintLabel;
diff --git a/src/frontend/netdetails/ipv6page.cpp b/src/frontend/netdetails/ipv6page.cpp
index 66d0e9ad..a08fa73b 100644
--- a/src/frontend/netdetails/ipv6page.cpp
+++ b/src/frontend/netdetails/ipv6page.cpp
@@ -57,18 +57,6 @@ void Ipv6Page::setMulDns(const QList<QHostAddress> &dns)
     m_dnsWidget->setDnsListText(dns);
 }
 
-#if 0
-void Ipv6Page::setIpv6FirDns(const QString &ipv6FirDns)
-{
-    firstDnsEdit->setText(ipv6FirDns);
-}
-
-void Ipv6Page::setIpv6SecDns(const QString &ipv6SecDns)
-{
-    secondDnsEdit->setText(ipv6SecDns);
-}
-#endif
-
 void Ipv6Page::setGateWay(const QString &gateWay)
 {
     gateWayEdit->setText(gateWay);
@@ -102,24 +90,17 @@ bool Ipv6Page::checkIsChanged(const ConInfo info, KyConnectSetting &setting)
         if(info.strIPV6Address != ipv6AddressEdit->text()
                 || info.iIPV6Prefix != lengthEdit->text().toInt()
                 || info.strIPV6GateWay != gateWayEdit->text()
-//                || info.strIPV6FirDns  != firstDnsEdit->text()
-//                || info.strIPV6SecDns  != secondDnsEdit->text()
                 || info.ipv6DnsList != ipv6dnsList) {
 
             qDebug() << "ipv6 info changed";
             QStringList dnsList;
             dnsList.clear();
             for (QHostAddress str: ipv6dnsList) {
-                dnsList << str.toString();
-            }
-#if 0
-            if (!firstDnsEdit->text().isEmpty()) {
-                dnsList << firstDnsEdit->text();
-                if (!secondDnsEdit->text().isEmpty()) {
-                    dnsList << secondDnsEdit->text();
+                if (!dnsList.contains(str.toString())) {
+                    dnsList << str.toString();
                 }
             }
-#endif
+
             QString ipv6address =ipv6AddressEdit->text();
             QString prefix = lengthEdit->text();
             QString gateWay = gateWayEdit->text();
@@ -136,15 +117,11 @@ void Ipv6Page::initUI() {
     ipv6AddressEdit = new LineEdit(this);
     lengthEdit = new LineEdit(this);
     gateWayEdit = new LineEdit(this);
-//    firstDnsEdit = new LineEdit(this);
-//    secondDnsEdit = new LineEdit(this);
 
     m_configLabel = new QLabel(this);
     m_addressLabel = new QLabel(this);
     m_subnetLabel = new QLabel(this);
     m_gateWayLabel = new QLabel(this);
-//    m_dnsLabel = new QLabel(this);
-//    m_secDnsLabel = new QLabel(this);
 
     m_configEmptyLabel = new QLabel(this);
     m_configEmptyLabel->setFixedHeight(LABEL_HEIGHT);
@@ -165,8 +142,6 @@ void Ipv6Page::initUI() {
     m_addressLabel->setText(tr("Address"));
     m_subnetLabel->setText(tr("Subnet prefix Length"));
     m_gateWayLabel->setText(tr("Default Gateway"));
-//    m_dnsLabel->setText(tr("Prefs DNS"));
-//    m_secDnsLabel->setText(tr("Alternative DNS"));
 
     m_statusLabel = new QLabel(this);
     m_statusLabel->setAlignment(Qt::AlignRight | Qt::AlignVCenter);
@@ -205,8 +180,6 @@ void Ipv6Page::initUI() {
     m_detailLayout->addRow(m_subnetLabel,lengthEdit);
     m_detailLayout->addRow(m_subnetEmptyLabel);
     m_detailLayout->addRow(m_gateWayLabel,gateWayWidget);
-//    m_detailLayout->addRow(m_dnsLabel,firstDnsEdit);
-//    m_detailLayout->addRow(m_secDnsLabel,secondDnsEdit);
     m_detailLayout->addRow(m_dnsWidget);
 
     ipv6ConfigCombox->addItem(tr("Auto(DHCP)")); //"自动(DHCP)"
@@ -214,8 +187,6 @@ void Ipv6Page::initUI() {
 
     ipv6AddressEdit->setValidator(new QRegExpValidator(ipv6_rx, this));
     gateWayEdit->setValidator(new QRegExpValidator(ipv6_rx, this));
-//    firstDnsEdit->setValidator(new QRegExpValidator(ipv6_rx, this));
-//    secondDnsEdit->setValidator(new QRegExpValidator(ipv6_rx, this));
 
     QRegExp prefix_rx("\\b(?:(?:12[0-8]|1[0-1][0-9]|^[1-9][0-9]?$)\\.){3}(?:12[0-8]|1[0-1][0-9]|^[1-9][0-9]?$)\\b");
     lengthEdit->setValidator(new QRegExpValidator(prefix_rx,this));
@@ -239,14 +210,6 @@ void Ipv6Page::initComponent() {
     connect(ipv6AddressEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
     connect(lengthEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
     connect(gateWayEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
-//    connect(firstDnsEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
-//    connect(secondDnsEdit, SIGNAL(textChanged(QString)), this, SLOT(setEnableOfSaveBtn()));
-    connect(m_dnsWidget, &MultipleDnsWidget::dnsTextChanged, this, [=]() {
-        setIpv6PageState(false);
-    });
-    connect(m_dnsWidget, &MultipleDnsWidget::dnsEditingFinished, this, [=]() {
-        setIpv6PageState(true);
-    });
 }
 
 void Ipv6Page::configChanged(int index) {
@@ -264,8 +227,6 @@ void Ipv6Page::setControlEnabled(bool check)
         ipv6AddressEdit->clear();
         lengthEdit->clear();
         gateWayEdit->clear();
-//        firstDnsEdit->clear();
-//        secondDnsEdit->clear();
 
         ipv6AddressEdit->setPlaceholderText(" ");
         lengthEdit->setPlaceholderText(" ");
@@ -279,8 +240,6 @@ void Ipv6Page::setControlEnabled(bool check)
     ipv6AddressEdit->setEnabled(check);
     lengthEdit->setEnabled(check);
     gateWayEdit->setEnabled(check);
-//    firstDnsEdit->setEnabled(check);
-//    secondDnsEdit->setEnabled(check);
     m_dnsWidget->setEditEnabled(check);
 }
 
@@ -338,22 +297,6 @@ bool Ipv6Page::checkConnectBtnIsEnabled()
             qDebug() << "ipv6 gateway empty or invalid";
             return false;
         }
-#if 0
-        if (firstDnsEdit->text().isEmpty() && !secondDnsEdit->text().isEmpty()) {
-            qDebug() << "ipv6 dns sort invalid";
-            return false;
-        }
-
-        if (!getIpv6EditState(firstDnsEdit->text())) {
-            qDebug() << "ipv6 first dns invalid";
-            return false;
-        }
-
-        if (!getIpv6EditState(secondDnsEdit->text())) {
-            qDebug() << "ipv6 second dns invalid";
-            return false;
-        }
-#endif
     }
     return true;
 }
diff --git a/src/frontend/netdetails/multiplednswidget.cpp b/src/frontend/netdetails/multiplednswidget.cpp
index 55aca598..da98d039 100644
--- a/src/frontend/netdetails/multiplednswidget.cpp
+++ b/src/frontend/netdetails/multiplednswidget.cpp
@@ -86,8 +86,6 @@ void MultipleDnsWidget::initComponent()
         item->setFlags(item->flags() | Qt::ItemIsEditable);
         ListItemEdit *dnsListItemEdit = new ListItemEdit(m_regExp);
         m_dnsListWidget ->setItemDelegateForRow(m_dnsListWidget->currentIndex().row(), dnsListItemEdit);
-        connect(dnsListItemEdit, SIGNAL(textChanged(QString)), this, SIGNAL(dnsTextChanged(QString)));
-        connect(dnsListItemEdit, SIGNAL(editingFinished()), this, SIGNAL(dnsEditingFinished()));
     });
 }
 
@@ -110,7 +108,7 @@ QList<QHostAddress> MultipleDnsWidget::getDns() const
     QString aDns;
     while (m_dnsListWidget->count() > row) {
         aDns = m_dnsListWidget->item(row)->text();
-        if (!dnsList.contains(aDns)) {
+        if (!dnsList.contains(aDns) && !aDns.isEmpty()) {
             dnsList << aDns;
             ipv4dnsList << QHostAddress(aDns);
         }
@@ -140,9 +138,6 @@ void MultipleDnsWidget::AddOneDnsItem(QListWidget *listWidget)
     ListItemEdit *dnsListItemEdit = new ListItemEdit(m_regExp);
     listWidget->setItemDelegateForRow(listWidget->currentIndex().row() , dnsListItemEdit);
     listWidget->editItem(dnsListWidgetItem);
-
-    connect(dnsListItemEdit, SIGNAL(textChanged(QString)), this, SIGNAL(dnsTextChanged(QString)));
-    connect(dnsListItemEdit, SIGNAL(editingFinished()), this, SIGNAL(dnsEditingFinished()));
 }
 
 void MultipleDnsWidget::RemoveOneDnsItem(QListWidgetItem *aItem, QListWidget *listWidget)
@@ -164,15 +159,19 @@ void MultipleDnsWidget::setDnsListWidgetStyle()
 
 void MultipleDnsWidget::onAddBtnClicked()
 {
+    AddOneDnsItem(m_dnsListWidget);
+
     //避免重复添加空白项
-    if (m_dnsListWidget->currentItem()) {
-        if (m_dnsListWidget->currentItem()->text().isEmpty()) {
-            m_dnsListWidget->removeItemWidget(m_dnsListWidget->currentItem());
-            delete m_dnsListWidget->currentItem();
+    int row = m_dnsListWidget->count() - 1;
+    while (row >= 0) {
+        if (!m_dnsListWidget->item(row)->isSelected()
+                && m_dnsListWidget->item(row)->text().isEmpty()) {
+            m_dnsListWidget->removeItemWidget(m_dnsListWidget->item(row));
+            delete m_dnsListWidget->item(row);
         }
+        row --;
     }
 
-    AddOneDnsItem(m_dnsListWidget);
     m_removeDnsBtn->setEnabled(true);
 }
 
diff --git a/src/frontend/netdetails/multiplednswidget.h b/src/frontend/netdetails/multiplednswidget.h
index 8a4ef1c4..5b32dd53 100644
--- a/src/frontend/netdetails/multiplednswidget.h
+++ b/src/frontend/netdetails/multiplednswidget.h
@@ -61,10 +61,6 @@ private Q_SLOTS:
     void setDnsListWidgetStyle();
     void onAddBtnClicked();
     void onRemoveBtnClicked();
-
-Q_SIGNALS:
-    void dnsTextChanged(const QString &);
-    void dnsEditingFinished();
 };
 
 #endif // MULTIPLEDNSWIDGET_H
diff --git a/src/frontend/tools/listitemedit.cpp b/src/frontend/tools/listitemedit.cpp
index af232060..4d47a2d0 100644
--- a/src/frontend/tools/listitemedit.cpp
+++ b/src/frontend/tools/listitemedit.cpp
@@ -30,8 +30,6 @@ QWidget *ListItemEdit::createEditor(QWidget *parent, const QStyleOptionViewItem
 {
     QLineEdit *editor = new QLineEdit(parent);
     editor->setValidator(new QRegExpValidator(m_regExp, parent));
-    connect(editor, SIGNAL(textChanged(QString)), this, SIGNAL(textChanged(QString)));
-    connect(editor, SIGNAL(editingFinished()), this, SIGNAL(editingFinished()));
     return editor;
 }
 
diff --git a/src/frontend/tools/listitemedit.h b/src/frontend/tools/listitemedit.h
index e6614099..901b51a6 100644
--- a/src/frontend/tools/listitemedit.h
+++ b/src/frontend/tools/listitemedit.h
@@ -44,9 +44,6 @@ public:
 private:
     QRegExp m_regExp;
 
-Q_SIGNALS:
-    void textChanged(const QString &);
-    void editingFinished();
 };
 
 #endif // LISTITEMEDIT_H