diff --git a/src/background.ts b/src/background.ts
index 68f06be94..03afd1f71 100644
--- a/src/background.ts
+++ b/src/background.ts
@@ -1,11 +1,10 @@
-'use strict'
-
+import 'reflect-metadata' // Required by TypoORM.
+;('use strict')
 import { app, protocol, BrowserWindow, ipcMain, shell, Menu } from 'electron'
 import { createProtocol } from 'vue-cli-plugin-electron-builder/lib'
 import installExtension, { VUEJS_DEVTOOLS } from 'electron-devtools-installer'
 import { updateConnectionMessage } from '@/api/connection'
 import { quitAndRenameLogger } from './utils/logger'
-import db from './database/index'
 import updateChecker from './main/updateChecker'
 import getMenuTemplate from './main/getMenuTemplate'
 import saveFile from './main/saveFile'
@@ -14,13 +13,14 @@ import newWindow from './main/newWindow'
 import useConnection, { initOptionModel } from '@/database/useConnection'
 import useServices from '@/database/useServices'
 
-interface WindowSizeModel {
-  width: number
-  height: number
-}
-
 declare const __static: string
 
+let theme: Theme = 'light'
+let autoCheckUpdate: boolean = true
+const windowSize = {
+  width: 1025,
+  height: 749,
+}
 const isDevelopment: boolean = process.env.NODE_ENV !== 'production'
 const isMac: boolean = process.platform === 'darwin'
 
@@ -30,10 +30,6 @@ let win: BrowserWindow | null
 
 let menu: Menu | null
 
-const windowSize = db.get<WindowSizeModel>('windowSize')
-
-const theme = db.get<Theme>('settings.currentTheme')
-
 // Scheme must be registered before the app is ready
 protocol.registerSchemesAsPrivileged([{ scheme: 'app', privileges: { secure: true, standard: true } }])
 
@@ -85,16 +81,18 @@ function beforeAppQuit() {
   app.quit()
 }
 
-async function beforeWindowReady() {
-  await ConnectionInit({
-    doMigrations: true,
-    undoMigrations: false,
-  } as initOptionModel)
+async function createWindow() {
+  // Init tables and connect to local database.
+  await ConnectionInit({ doMigrations: true } as initOptionModel)
   const { settingService } = useServices()
   await settingService.setSetting()
-}
-
-function createWindow() {
+  const setting = await settingService.getSetting()
+  if (setting) {
+    theme = setting.currentTheme
+    autoCheckUpdate = setting.autoCheck
+    windowSize.height = setting.height
+    windowSize.width = setting.width
+  }
   // Create the browser window.
   win = new BrowserWindow({
     ...windowSize,
@@ -133,8 +131,27 @@ function createWindow() {
     win = null
     beforeAppQuit()
   })
+  handleIpcMessages()
+  if (autoCheckUpdate) {
+    updateChecker()
+  }
 }
 
+// This method will be called when Electron has finished
+// initialization and is ready to create browser windows.
+// Some APIs can only be used after this event occurs.
+app.on('ready', async () => {
+  if (isDevelopment && !process.env.IS_TEST) {
+    // Install Vue Devtools
+    try {
+      await installExtension(VUEJS_DEVTOOLS)
+    } catch (e) {
+      console.error('Vue Devtools failed to install:', e.toString())
+    }
+  }
+  createWindow()
+})
+
 // Quit when all windows are closed.
 app.on('window-all-closed', () => {
   // On macOS it is common for applications and their menu bar
@@ -152,27 +169,6 @@ app.on('activate', () => {
   }
 })
 
-// This method will be called when Electron has finished
-// initialization and is ready to create browser windows.
-// Some APIs can only be used after this event occurs.
-app.on('ready', async () => {
-  await beforeWindowReady()
-  const autoCheckUpdate = db.get<boolean>('settings.autoCheck')
-  if (isDevelopment && !process.env.IS_TEST) {
-    // Install Vue Devtools
-    try {
-      await installExtension(VUEJS_DEVTOOLS)
-    } catch (e) {
-      console.error('Vue Devtools failed to install:', e.toString())
-    }
-  }
-  createWindow()
-  handleIpcMessages()
-  if (autoCheckUpdate) {
-    updateChecker()
-  }
-})
-
 // Disabled create new window
 app.on('web-contents-created', (event, contents) => {
   // tslint:disable-next-line:no-shadowed-variable
diff --git a/src/database/services/SettingService.ts b/src/database/services/SettingService.ts
index 805625bff..ba1c1e73e 100644
--- a/src/database/services/SettingService.ts
+++ b/src/database/services/SettingService.ts
@@ -11,6 +11,18 @@ export default class SettingService {
   ) {}
 
   public async setSetting() {
+    const data = await this.collectionRepository.find()
+    if (data.length) {
+      return
+    }
     return await this.collectionRepository.insert({})
   }
+
+  public async getSetting() {
+    const data = await this.collectionRepository.find()
+    if (!data.length) {
+      return
+    }
+    return data[0]
+  }
 }
diff --git a/src/database/useConnection.ts b/src/database/useConnection.ts
index ce2c3ea97..464b93979 100644
--- a/src/database/useConnection.ts
+++ b/src/database/useConnection.ts
@@ -12,10 +12,11 @@ const useConnection = () => {
     useContainer(Container)
     sqlConnection = await createConnection(ORMConfig)
     if (initOption.doMigrations) {
-      sqlConnection.runMigrations()
+      await sqlConnection.runMigrations()
     } else if (initOption.undoMigrations) {
-      sqlConnection.undoLastMigration()
+      await sqlConnection.undoLastMigration()
     }
+    return sqlConnection
   }
   async function ConnectionDestory() {
     if (sqlConnection) {
diff --git a/src/main.ts b/src/main.ts
index 99040d106..f20b4d5e2 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,24 +1,24 @@
 import 'reflect-metadata' // Required by TypoORM.
 import Vue from 'vue'
+import VueI18n from 'vue-i18n'
+import VueClipboard from 'vue-clipboard2'
+import path from 'path'
+import log4js from 'log4js'
 
 import 'element-ui/lib/theme-chalk/index.css'
 import ElementLocale from 'element-ui/lib/locale'
+
 import App from './App.vue'
 import router from './router/index'
 import store from './store/index'
-import VueI18n from 'vue-i18n'
-import VueClipboard from 'vue-clipboard2'
 import Lang from './lang'
 import element from './utils/element'
 import VueLog4js from './plugins/logPlugin/index'
-import log4js from 'log4js'
 import { getOrCreateLogDir } from './utils/logger'
 import logConfig from './plugins/logPlugin/logConfig.json'
-import path from 'path'
 import useConnection, { initOptionModel } from './database/useConnection'
 
 const { ConnectionInit } = useConnection()
-
 // Init typeORM connection before Vue APP start, after this DI services are available.
 ConnectionInit({ doMigrations: false, undoMigrations: false } as initOptionModel).then(() => {
   const LOG_DIR = getOrCreateLogDir()