diff --git a/src/dialogs/AccountFormDialog.cpp b/src/dialogs/AccountFormDialog.cpp
index 407ab72..aea23e3 100644
--- a/src/dialogs/AccountFormDialog.cpp
+++ b/src/dialogs/AccountFormDialog.cpp
@@ -10,13 +10,13 @@
 #include <QToolButton>
 #include <QPushButton>
 
-#include "ChangePasswordFormDialog.h"
 #include "event/EventCenter.h"
 #include "log/UserOperationLog.h"
 #include "db/SQLHelper.h"
 #include "models/User.h"
 #include "AlertDialog.h"
 #include "components/ULineEdit.h"
+#include "DialogManager.h"
 
 AccountFormDialog::AccountFormDialog(QWidget* parent, AccountEditMode mode, Qt::WindowFlags f)
     : GUIFormBaseDialog(parent, f)
@@ -95,10 +95,7 @@ void AccountFormDialog::resetUserPassword()
 
 void AccountFormDialog::changeSelfPassword()
 {
-    ChangePasswordFormDialog dia(this);
-    dia.setGeometry(geometry());
-    dia.setWindowModality(Qt::WindowModal);
-    dia.exec();
+    DialogManager::Default()->requestChangePassword();
 }
 
 void AccountFormDialog::addButtonPwd(QHBoxLayout* layout)
diff --git a/src/dialogs/DialogManager.cpp b/src/dialogs/DialogManager.cpp
index 015c2cd..46b0f7b 100644
--- a/src/dialogs/DialogManager.cpp
+++ b/src/dialogs/DialogManager.cpp
@@ -6,10 +6,24 @@
 
 #include <QApplication>
 #include <QWidget>
+#include <QThread>
 
 #include "event/EventCenter.h"
 #include "dialogs/GUIMessageDialog.h"
+#include "dialogs/ChangePasswordFormDialog.h"
+#include "dialogs/AccountFormDialog.h"
 #include "appvals/AppGlobalValues.h"
+#include "windows/LoginDialog.h"
+
+
+
+DialogManager::DialogManager()
+: QObject()
+, mFunctionDialog(nullptr)
+, mMessageDialog(nullptr)
+{
+
+}
 
 void DialogManager::init() {
     connect(EventCenter::Default(), &EventCenter::DeviceErrorRaise,this,&DialogManager::raiseDeviceError);
@@ -24,36 +38,86 @@ QWidget *DialogManager::getTopWidget() {
     return QApplication::activeWindow();
 }
 
+void DialogManager::requestLogin()
+{
+    //Login 直接最顶层模态
+    if (!mFunctionDialog){
+        mFunctionDialog = new LoginDialog;
+    }
+    mFunctionDialog->exec();
+    while (QDialog::Accepted != mFunctionDialog->result())
+    {
+        mFunctionDialog->exec();
+    }
+}
+
+int DialogManager::requestAddAccount(QSqlTableModel* model) {
+    AccountFormDialog dialog(getTopWidget(), New);
+    topWidgetStore.push(&dialog);
+    dialog.setWindowModality(Qt::WindowModal);
+    dialog.setReferenceModel(model);
+    int ret =  dialog.exec();
+    topWidgetStore.pop();
+    return ret;
+}
+
+int DialogManager::requestEditSelfAccount() {
+    AccountFormDialog dialog(getTopWidget(), Self);
+    topWidgetStore.push(&dialog);
+    dialog.setWindowModality(Qt::WindowModal);
+    int ret =  dialog.exec();
+    topWidgetStore.pop();
+    return ret;
+}
+
+int DialogManager::requestEditAdminAccount(const QMap<QString, QVariant>& values) {
+    AccountFormDialog dialog(getTopWidget(), Admin);
+    topWidgetStore.push(&dialog);
+    dialog.setAccountInformation(values);
+    dialog.setWindowModality(Qt::WindowModal);
+    int ret =  dialog.exec();
+    topWidgetStore.pop();
+    return ret;
+}
+
+void DialogManager::requestChangePassword() {
+    ChangePasswordFormDialog dialog(getTopWidget());
+    topWidgetStore.push(&dialog);
+    dialog.setGeometry(getTopWidget()->geometry());
+    dialog.setWindowModality(Qt::WindowModal);
+    dialog.exec();
+    topWidgetStore.pop();
+}
+
+//考虑以后使用另外的dialog显示错误
 void DialogManager::raiseDeviceError(QObject *parent, QObject *msg) {
     if (!this->getTopWidget()->isVisible()) return;
+    clearMessageDialog();
     //new dialog
     auto dialog = new GUIMessageDialog(this->getTopWidget());
-    if (msg)
-    {
-        QString* str = (QString*)msg;
+    if (msg) {
+        QString *str = (QString *) msg;
         dialog->showMessage(*str);
-    }
-    else
-    {
+    } else {
         dialog->showMessage("Something went error!");
     }
     dialog->stopLoading();
     dialog->showExitButton();
-    if (dialog->isHidden())
-    {
-        topWidgetStore.push(dialog);
-        dialog->setWindowModality(Qt::NonModal);
-        dialog->exec();
-        topWidgetStore.pop();
-    }
+    topWidgetStore.push(dialog);
+    dialog->setWindowModality(Qt::NonModal);
+    dialog->exec();
+    mErrorCount.fetch_sub(1);
+    auto lastDialog = topWidgetStore.pop();
+    lastDialog->deleteLater();
 }
 
+// 扫描过程 dialog 只能为最底层，并且会被error dialog 清除！
 void DialogManager::invokeOperationStart(QObject *parent, QObject *msg) {
-    if (mMessageDialog)
-    {
-        mMessageDialog->hide();
-        delete mMessageDialog;
-    }
+    //没有目标parent 撤销操作
+    if (!QApplication::activeWindow()) return;
+    //只能在最底层窗口上模态
+    if (!topWidgetStore.isEmpty()) return;
+    clearMessageDialog();
     mMessageDialog = new GUIMessageDialog(this->getTopWidget());
     if (msg)
     {
@@ -74,7 +138,8 @@ void DialogManager::invokeOperationStart(QObject *parent, QObject *msg) {
 }
 
 void DialogManager::invokeOperationProgress(QObject *parent, QObject *msg) {
-    if (!mMessageDialog) mMessageDialog = new GUIMessageDialog(this->getTopWidget());
+    //窗口不存在，撤销操作
+    if (!mMessageDialog) return;
     if (msg)
     {
         QVariant* var = (QVariant*)msg;
@@ -95,6 +160,7 @@ void DialogManager::invokeOperationProgress(QObject *parent, QObject *msg) {
 }
 
 void DialogManager::invokeOperationPending(QObject *parent, QObject *msg) {
+    //窗口不存在，撤销操作
     if (!mMessageDialog) return;
     if (!mMessageDialog->Pending())
     {
@@ -105,10 +171,8 @@ void DialogManager::invokeOperationPending(QObject *parent, QObject *msg) {
 }
 
 void DialogManager::invokeOperationEnd(QObject *parent, QObject *msg) {
-    if (!mMessageDialog)
-    {
-        return;
-    }
+    //窗口不存在，撤销操作
+    if (!mMessageDialog) return;
     if (!mMessageDialog->isHidden())
     {
         if (msg && ((QVariant*)msg)->toBool())
@@ -128,3 +192,15 @@ void DialogManager::invokeOperationEnd(QObject *parent, QObject *msg) {
         AppGlobalValues::setInProcessing(false);
     }
 }
+
+void DialogManager::clearMessageDialog() {
+    if (mMessageDialog){
+        if (!mMessageDialog->isHidden()) mMessageDialog->hide();
+        delete mMessageDialog;
+        mMessageDialog = nullptr;
+    }
+}
+
+DialogManager::~DialogManager() {
+    clearMessageDialog();
+}
diff --git a/src/dialogs/DialogManager.h b/src/dialogs/DialogManager.h
index ff29a46..192692e 100644
--- a/src/dialogs/DialogManager.h
+++ b/src/dialogs/DialogManager.h
@@ -6,11 +6,14 @@
 #define GUI_DIALOGMANAGER_H
 
 #include <QObject>
+#include <mutex>
 #include <QStack>
+#include <atomic>
 
 class QWidget;
 class QDialog;
 class GUIMessageDialog;
+class QSqlTableModel;
 
 class DialogManager:public QObject {
 public:
@@ -19,20 +22,27 @@ public:
         return &manager;
     }
 
-    DialogManager() = default;
+    DialogManager();
 
-    ~DialogManager() override = default;
+    ~DialogManager() override;
 
     void init();
     QWidget* getTopWidget();
+    void requestLogin();
+    int requestAddAccount(QSqlTableModel* model);
+    int requestEditSelfAccount();
+    int requestEditAdminAccount(const QMap<QString, QVariant>& values);
+    void requestChangePassword();
     void raiseDeviceError(QObject* parent, QObject* msg);
     void invokeOperationStart(QObject* parent, QObject* msg);
     void invokeOperationProgress(QObject* parent, QObject* msg);
     void invokeOperationPending(QObject* parent, QObject* msg);
     void invokeOperationEnd(QObject* parent, QObject* msg);
 private:
-    QDialog* mDialog = nullptr;
-    GUIMessageDialog* mMessageDialog = nullptr;
+    void clearMessageDialog();
+
+    QDialog* mFunctionDialog;
+    GUIMessageDialog* mMessageDialog;
     QStack<QDialog*> topWidgetStore;
 };
 
diff --git a/src/forms/scan/ScanFormWidget.cpp b/src/forms/scan/ScanFormWidget.cpp
index a9ac719..90cd207 100644
--- a/src/forms/scan/ScanFormWidget.cpp
+++ b/src/forms/scan/ScanFormWidget.cpp
@@ -135,10 +135,11 @@ void ScanFormWidget::initScanControlBar(QHBoxLayout *layout){
     mBtnPreview->setEnabled(false);
     mBtnStop->setEnabled(false);
 
-    layout->addWidget(mBtnScan);
+
     layout->addWidget(mBtnRefresh);
     layout->addWidget(mBtnPreview);
     layout->addWidget(mBtnStop);
+    layout->addWidget(mBtnScan);
     connect(mBtnRefresh, &QToolButton::clicked, [=]() {
         QString patientInf(mPatInf->getCurrentPatientJsonString(true));
         LOG_USER_OPERATION(StartRefresh)
diff --git a/src/forms/settings/AccountTableForm.cpp b/src/forms/settings/AccountTableForm.cpp
index 3ac1c13..53e123e 100644
--- a/src/forms/settings/AccountTableForm.cpp
+++ b/src/forms/settings/AccountTableForm.cpp
@@ -11,10 +11,10 @@
 
 #include "components/AccountRoleComboDelegate.h"
 #include "dialogs/AlertDialog.h"
+#include "dialogs/DialogManager.h"
 #include "db/SQLHelper.h"
 #include "models/User.h"
 #include "components/SlideTableView.h"
-#include "dialogs/AccountFormDialog.h"
 #include "event/EventCenter.h"
 
 AccountTableForm::AccountTableForm(QWidget* aParent)
@@ -87,14 +87,11 @@ AccountTableForm::AccountTableForm(QWidget* aParent)
 
     //add new account
     connect(btnAdd, &QToolButton::clicked, [=]() {
-        AccountFormDialog dialog(this, New);
-        dialog.setWindowModality(Qt::WindowModal);
-        dialog.setReferenceModel(model);
-        if (dialog.exec() == QDialog::Accepted)
+        if (DialogManager::Default()->requestAddAccount(model) == QDialog::Accepted)
         {
             table->selectRow(0);
         }
-        });
+    });
 
     connect(btnEdit, &QToolButton::clicked, [=]() {
         if (mCurrentRow < 0)
@@ -107,16 +104,19 @@ AccountTableForm::AccountTableForm(QWidget* aParent)
         {
             map[record.fieldName(i)] = record.value(i);
         }
-        auto mode = map["UserID"] == User::Current()->getUserID() ? Self : Admin;
-        AccountFormDialog dialog(this, mode);
-        dialog.setWindowModality(Qt::WindowModal);
-        if (mode == Admin)dialog.setAccountInformation(map);
-        if (dialog.exec() == QDialog::Accepted)
+        int ret =0;
+        if (map["UserID"] == User::Current()->getUserID()){
+            ret = DialogManager::Default()->requestEditSelfAccount();
+        }
+        else{
+            ret = DialogManager::Default()->requestEditAdminAccount(map);
+        }
+        if (ret == QDialog::Accepted)
         {
             model->select();
             table->selectRow(mCurrentRow);
         }
-        });
+    });
 
     connect(btnDelete, &QToolButton::clicked, [=]() {
         if (mCurrentRow < 0)
diff --git a/src/windows/LoginDialog.cpp b/src/windows/LoginDialog.cpp
index dccd6f0..39120b9 100644
--- a/src/windows/LoginDialog.cpp
+++ b/src/windows/LoginDialog.cpp
@@ -1,6 +1,8 @@
 #include "LoginDialog.h"
 
 #include <QVBoxLayout>
+#include <QApplication>
+#include <QDeskTopWidget>
 #include <QToolButton>
 #include <QtWidgets/QLabel>
 
@@ -24,6 +26,7 @@ LoginDialog::LoginDialog(QWidget* aParent)
 {
     initializeAllWidget();
     setWindowFlags(windowFlags() | Qt::Window | Qt::FramelessWindowHint | Qt::WindowSystemMenuHint);
+    setGeometry(QApplication::desktop()->screenGeometry());
     mAccountEdit->setText(JsonObject::Instance()->defaultUser());
 }
 
@@ -148,4 +151,9 @@ void LoginDialog::doLogin()
     }
 }
 
+void LoginDialog::accept() {
+    QDialog::accept();
+    clearInputData();
+}
+
 
diff --git a/src/windows/LoginDialog.h b/src/windows/LoginDialog.h
index fa49d2e..d463bf2 100644
--- a/src/windows/LoginDialog.h
+++ b/src/windows/LoginDialog.h
@@ -19,6 +19,7 @@ public:
     LoginDialog(QWidget* aParent = nullptr);
     ~LoginDialog() override;
 
+    void accept() override;
     void clearInputData();
 
 signals:
diff --git a/src/windows/MainWindow.cpp b/src/windows/MainWindow.cpp
index 770f2ca..cc84651 100644
--- a/src/windows/MainWindow.cpp
+++ b/src/windows/MainWindow.cpp
@@ -15,6 +15,7 @@
 #include "forms/settings/SettingFormWidget.h"
 #include "forms/TopBarWidget.h"
 #include "dialogs/GUIMessageDialog.h"
+#include "dialogs/DialogManager.h"
 #include "device/DeviceManager.h"
 #include "errorhandle/GUIErrorHandle.h"
 #include "LoginDialog.h"
@@ -64,7 +65,7 @@ MainWindow::MainWindow(QWidget* aParent)
         }
     });
     mThread->start();
-    centerWidgetHide();
+    QApplication::setActiveWindow(centralWidget());
 }
 
 MainWindow::~MainWindow()
@@ -266,17 +267,7 @@ void MainWindow::swipeTriggered(QSwipeGesture* aSwipeGesture)
 
 void MainWindow::requestLogin()
 {
-    mLoginDialog->clearInputData();
-    mLoginDialog->setWindowModality(Qt::WindowModal);
-    mLoginDialog->showFullScreen();
-    centerWidgetHide();
-    QApplication::setActiveWindow(mLoginDialog);
-    while (QDialog::Accepted != mLoginDialog->result())
-    {
-        mLoginDialog->exec();
-    }
-    mLoginDialog->setResult(QDialog::Rejected);
-    centerWidgetShow();
+    DialogManager::Default()->requestLogin();
     QApplication::setActiveWindow(centralWidget());
 }