diff --git a/electron/config/config.default.js b/electron/config/config.default.js
index 8f3d7ec..945e364 100644
--- a/electron/config/config.default.js
+++ b/electron/config/config.default.js
@@ -23,7 +23,7 @@ module.exports = () => {
         //preload: path.join(getElectronDir(), 'preload', 'bridge.js'),
       },
       frame: true,
-      show: true,
+      show: false,
       icon: path.join(getBaseDir(), 'public', 'images', 'logo-32.png'),
     },
     logger: {
diff --git a/electron/jobs/example/timer.js b/electron/jobs/example/timer.js
index ed70364..6fe19a6 100644
--- a/electron/jobs/example/timer.js
+++ b/electron/jobs/example/timer.js
@@ -5,6 +5,7 @@ const { isChildJob, exit } = require('ee-core/ps');
 const { childMessage } = require('ee-core/message');
 const { welcome } = require('./hello');
 const { UserService } = require('../../service/job/user');
+const { sqlitedbService } = require('../../service/database/sqlitedb');
 
 /**
  * example - TimerJob
@@ -12,20 +13,21 @@ const { UserService } = require('../../service/job/user');
  */
 class TimerJob {
 
-  constructor(params) {
-    this.params = params;
+  constructor() {
     this.timer = undefined;
     this.timeoutTimer = undefined;
     this.number = 0;
     this.countdown = 10; // 倒计时
+    sqlitedbService.init();
   }
 
   /**
    * handle()方法是必要的，且会被自动调用
+   * params 传递的参数
    */
-  async handle () {
-    logger.info("[child-process] TimerJob params: ", this.params);
-    const { jobId } = this.params;
+  async handle(params) {
+    logger.info("[child-process] TimerJob params: ", params);
+    const { jobId } = params;
 
     // 子进程中使用service
     // 1. 确保引入的 service 中不能有electron 的 api或依赖， electron 不支持
@@ -33,7 +35,14 @@ class TimerJob {
     userService.hello('job');
 
     // 执行任务
+    // 多次运行时，重置倒计时
+    this.number = 0;
+    this.countdown = 10;
     this.doTimer(jobId);
+
+    // sqlite
+    const userList = await sqlitedbService.getAllTestDataSqlite();
+    logger.info('[child-process] Sqlite userList:', userList);
   }
   
   /**
diff --git a/electron/preload/lifecycle.js b/electron/preload/lifecycle.js
index a18a2cc..cd75ef5 100644
--- a/electron/preload/lifecycle.js
+++ b/electron/preload/lifecycle.js
@@ -1,5 +1,6 @@
 'use strict';
 
+const { app: electronApp, screen } = require('electron');
 const { logger } = require('ee-core/log');
 const { getConfig } = require('ee-core/config');
 const { getMainWindow } = require('ee-core/electron');
@@ -18,6 +19,16 @@ class Lifecycle {
    */
   async electronAppReady() {
     logger.info('[lifecycle] electron-app-ready');
+
+    // When double clicking the icon, display the opened window
+    electronApp.on('second-instance', () => {
+      const win = getMainWindow();
+      if (win.isMinimized()) {
+        win.restore();
+      }
+      win.show();
+      win.focus();
+    });
   }
 
   /**
@@ -25,10 +36,23 @@ class Lifecycle {
    */
   async windowReady() {
     logger.info('[lifecycle] window-ready');
-    // 延迟加载，无白屏
+
+    const win = getMainWindow();
+
+    // The window is centered and scaled proportionally
+    // Obtain the size information of the main screen, calculate the width and height of the window as a percentage of the screen, 
+    // and calculate the coordinates of the upper left corner when the window is centered
+    const mainScreen = screen.getPrimaryDisplay();
+    const { width, height } = mainScreen.workAreaSize;
+    const windowWidth = Math.floor(width * 0.6);
+    const windowHeight = Math.floor(height * 0.8);
+    const x = Math.floor((width - windowWidth) / 2);
+    const y = Math.floor((height - windowHeight) / 2);
+    win.setBounds({ x, y, width: windowWidth, height: windowHeight })
+
+    // Delayed loading, no white screen
     const { windowsOption } = getConfig();
     if (windowsOption.show == false) {
-      const win = getMainWindow();
       win.once('ready-to-show', () => {
         win.show();
         win.focus();
diff --git a/package.json b/package.json
index bb67be1..2bdde8d 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
   "devDependencies": {
     "@electron/rebuild": "^3.7.1",
     "@types/better-sqlite3": "^7.6.12",
-    "@types/node": "^22.10.2",
+    "@types/node": "^20.16.0",
     "cross-env": "^7.0.3",
     "debug": "^4.4.0",
     "ee-bin": "^4.1.4",
@@ -53,7 +53,7 @@
     "axios": "^1.7.9",
     "better-sqlite3": "^11.7.0",
     "dayjs": "^1.11.13",
-    "ee-core": "^4.0.1",
+    "ee-core": "^4.1.0",
     "electron-updater": "^6.3.8"
   }
 }