diff --git a/config.php b/config.php
index e1d2810..e819fe4 100644
--- a/config.php
+++ b/config.php
@@ -35,8 +35,8 @@
             'minTime'=> 0.0001, //单个job最少执行时间
         ],
         'topics'  => [
-            //'autoAckBeforeJobStart'    => true, // true 开启； false 关闭；job没跑之前是否直接ack,这样业务代码里面有exit、die等致命错误会丢弃消息，防止消息积压
-            ['name'=>'MyJob', 'workerMinNum'=>1, 'workerMaxNum'=>3, 'queueMaxNum'=>10000, 'queueMaxNumForProcess' => 100, 'autoAckBeforeJobStart'=>false],
+            //'autoAckBeforeJobStart'    => true, // true 开启； false 关闭；默认为true，job没跑之前是否直接ack,这样业务代码里面有exit、die等致命错误会丢弃消息，防止消息积压
+            ['name'=>'MyJob', 'workerMinNum'=>1, 'workerMaxNum'=>3, 'queueMaxNum'=>10000, 'queueMaxNumForProcess' => 100, 'autoAckBeforeJobStart'=>true],
             ['name'=> 'MyJob2', 'workerMinNum'=>1, 'workerMaxNum'=>3, 'autoAckBeforeJobStart'=>true],
             ['name'=> 'MyJob3', 'workerMinNum'=>1, 'workerMaxNum'=>1],
             ['name'=> 'DefaultClassMethod.test1', 'workerMinNum'=>1, 'workerMaxNum'=>2, 'defaultJobClass'=>'DefaultClassMethod', 'defaultJobMethod'=>'test1'],
diff --git a/src/Config.php b/src/Config.php
index 6e9e2cd..3946cc0 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * This file is part of PHP CS Fixer.
+ * This file is part of Swoole-jobs
  * (c) kcloze <pei.greet@qq.com>
  * This source file is subject to the MIT license that is bundled
  * with this source code in the file LICENSE.
@@ -36,11 +36,10 @@ public static function getConfig()
      * @param mixed $topic
      * @param mixed $name
      *  */
-
     public static function getTopicConfig($config, $topic, $name)
     {
         $key=array_search($topic, array_column($config, 'name'), true);
 
-        return $config[$key][$name] ?? false;
+        return $config[$key][$name] ?? true;
     }
 }
diff --git a/src/Jobs.php b/src/Jobs.php
index f7a1342..b653c71 100644
--- a/src/Jobs.php
+++ b/src/Jobs.php
@@ -75,7 +75,7 @@ public function run($topic='')
                     }
 
                     $this->logger->log('pop data: ' . json_encode($data), 'info');
-                    $autoAckBeforeJobStart=Config::getTopicConfig($this->config['job']['topics'], $topic, 'autoAckBeforeJobStart');
+                    $autoAckBeforeJobStart=Config::getTopicConfig($this->config['job']['topics'], $topic, 'autoAckBeforeJobStart') ?? true;
                     if (true === $autoAckBeforeJobStart) {
                         $this->queue->ack();
                     }
diff --git a/src/Jobs/MyJob.php b/src/Jobs/MyJob.php
index 31919f7..d4b0442 100644
--- a/src/Jobs/MyJob.php
+++ b/src/Jobs/MyJob.php
@@ -17,7 +17,7 @@ public static function test1($a, $b)
         // $client = new \GuzzleHttp\Client();
         // $res    = $client->request('GET', 'https://www.oschina.net/', ['timeout' => 3]);
         // echo $res->getStatusCode() . ' test1| title: ' . $a . ' time: ' . $b . PHP_EOL;
-        die('oh,my gad!');
+        die('oh,my gad!').PHP_EOL;//模拟job异常退出，如果设置autoAckBeforeJobStart为false，则消息出队列之后会回到队列，消息不丢失
         echo  ' test1| title: ' . $a . ' time: ' . $b . PHP_EOL;
     }