diff --git a/electron/main.js b/electron/main.js
index b6892a8..2692715 100644
--- a/electron/main.js
+++ b/electron/main.js
@@ -12,6 +12,13 @@ const path = require('path');
 const url = require('url');
 const { initialStorageEvents, storage } = require('./storage');
 
+const gotTheLock = app.requestSingleInstanceLock();
+
+if (!gotTheLock) {
+  app.quit();
+  return;
+}
+
 let mainWindow;
 
 const isDev = process.env.NODE_ENV === 'development';
diff --git a/src/app.ts b/src/app.ts
index f5c1a16..bfeb805 100644
--- a/src/app.ts
+++ b/src/app.ts
@@ -147,3 +147,8 @@ export async function getInitialState(): Promise<{
 
 // 链接socket
 initialWebsocket();
+
+// 消息通知配置
+notification.config({
+  top: 48 + 10,
+});