diff --git a/common.mjs b/common.mjs
index c120597..692dc1d 100644
--- a/common.mjs
+++ b/common.mjs
@@ -3,7 +3,7 @@
  */
 
 import fs from 'node:fs';
-import { readdir, readFile } from 'node:fs/promises';
+import { readdir, readFile, appendFile } from 'node:fs/promises';
 import { resolve } from 'node:path';
 import { Buffer } from 'node:buffer';
 import md5 from 'md5';
@@ -213,6 +213,22 @@ class Common {
         return Buffer.byteLength(str, 'utf8');
     }
 
+    //保存log到指定文件
+    async saveLog(filePath, content) {
+        let saved = false;
+
+        try {
+            let saveRes = await appendFile(filePath, content);
+            if (saveRes == undefined) {
+                saved = true;
+            }
+        } catch (err) {
+            console.error(`Log save to %s failed: %s`, filePath, err.message);
+        }
+
+        return saved;
+    }
+
 }
 
 let commonFuns = new Common();
diff --git a/conf/config.json b/conf/config.json
index f6a6930..df5e873 100644
--- a/conf/config.json
+++ b/conf/config.json
@@ -9,15 +9,21 @@
     "notify_timeout": 8,
     "notify_max_try": 5,
 
+    "task_timeout": 600,
+    "task_max_try": 5,
+
     "reloadConfigFrequence": 1,
     "heroHeartCheckFrequence": 1,
     "autoCleanTaskFrequence": 5,
     "autoNotifyTaskFrequence": 1,
+    "autoResetWaitingTaskFrequence": 6,
 
     "max_list_hero_num": 1000,
 
     "axios_proxy": false,
 
+    "systemLogDir": "log/",
+
     "tokens": {
         "herounion_demo": "hello#world!"
     }
diff --git a/heroUnion.mjs b/heroUnion.mjs
index d955927..8f6d3ac 100644
--- a/heroUnion.mjs
+++ b/heroUnion.mjs
@@ -14,6 +14,10 @@
  * --数据缓存规则--
  * 任务结果数据最大不超过1M，超过的当任务处理失败处理
  * 任务数据保存最长 1 天
+ *
+ * --异常处理规则--
+ * 任务处理超时后将进行中的任务状态改为等待中，以便其它爬虫处理
+ * 任务处理超过最多尝试次数，则标记为失败
  */
 
 import fs from 'node:fs';
@@ -31,9 +35,11 @@ class HeroUnion {
         this.config = null;
 
         //默认配置
-        //this.task_data_dir = path.resolve('./tmp/data/');    //任务数据保存目录
+        this.systemLogDir = 'log/';                            //系统日志保存目录
         this.task_cache_time = 86400;                          //任务数据最长缓存时间，单位：秒
         this.task_data_max_size = 1024;                        //任务数据最大字节数，单位：KB，默认最大1M
+        this.task_timeout = 600;                               //任务处理超时时长，单位：秒
+        this.task_max_try = 5;                                 //任务处理最多尝试次数
         this.notify_timeout = 8;                               //回调通知请求超时时长，单位：秒
         this.notify_max_try = 5;                               //回调通知最多尝试次数
         this.heroHeartTimeout = 600;                           //爬虫心跳超时时长，单位：秒
@@ -91,37 +97,19 @@ class HeroUnion {
     }
 
     async getConfig(forceReload) {
+        const _self = this;
+
         if ( !this.config || (typeof(forceReload) != 'undefined' && forceReload) ) {
-            this.config = await common.getConfigFromJsonFile('config.json');
+            let config = await common.getConfigFromJsonFile('config.json');
 
             //覆盖默认配置
-            if (typeof(this.config.task_cache_time) != 'undefined' && this.config.task_cache_time) {
-                this.task_cache_time = this.config.task_cache_time;    //任务数据最长缓存时间，单位：秒
-            }
-
-            if (typeof(this.config.task_data_max_size) != 'undefined' && this.config.task_data_max_size) {
-                this.task_data_max_size = this.config.task_data_max_size;    //任务数据最大字节数，单位：KB
-            }
-
-            if (typeof(this.config.notify_timeout) != 'undefined' && this.config.notify_timeout) {
-                this.notify_timeout = this.config.notify_timeout;    //回调通知请求超时时长，单位：秒
-            }
-
-            if (typeof(this.config.notify_max_try) != 'undefined' && this.config.notify_max_try) {
-                this.notify_max_try = this.config.notify_max_try;    //最多回调通知次数
-            }
-
-            if (typeof(this.config.heroHeartTimeout) != 'undefined' && this.config.heroHeartTimeout) {
-                this.heroHeartTimeout = this.config.heroHeartTimeout;    //爬虫心跳超时时长，单位：秒
-            }
-
-            if (typeof(this.config.max_list_hero_num) != 'undefined' && this.config.max_list_hero_num) {
-                this.max_list_hero_num = this.config.max_list_hero_num;    //最大返回爬虫数量
+            for (const key in config) {
+                if (typeof(_self[key]) != 'undefined') {
+                    _self[key] = config[key];
+                }
             }
 
-            if (typeof(this.config.axios_proxy) != 'undefined' && this.config.axios_proxy) {
-                this.axios_proxy = this.config.axios_proxy;
-            }
+            this.config = config;
         }
 
         return this.config;
@@ -164,10 +152,11 @@ class HeroUnion {
      *  error: '',
      *  notified: false,      //是否成功发送回调通知
      *  notify_time: 0,       //回调通知次数
+     *  try_time: 0,          //任务处理次数
      *  token: ''             //任务密钥，爬虫完成任务回传数据的时候用它签名
      * }
      **/
-    createTask(uuid, url, platform, contract, data_mode, notify_url, country, lang) {
+    async createTask(uuid, url, platform, contract, data_mode, notify_url, country, lang) {
         let timestamp = common.getTimestampInSeconds();
 
         let task = {
@@ -176,6 +165,7 @@ class HeroUnion {
 
             notified: false,
             notify_time: 0,
+            try_time: 0,
 
             //必选
             uuid: uuid,
@@ -211,6 +201,13 @@ class HeroUnion {
         this.taskStatus.total ++;
         this.taskStatus.waiting ++;
 
+        //保存任务日志
+        let config = await this.getConfig();
+        let logFile = path.resolve(config.systemLogDir) + '/tasks.log';
+        common.saveLog(logFile, JSON.stringify(task) + "\n");
+
+        common.log('Task %s created, url %s, notify url %s.', task.id, url, notify_url);
+
         return task;
     }
 
@@ -248,6 +245,10 @@ class HeroUnion {
             this.tasks[taskIndex].status = 'running';
             //为task生成一个随机密钥，便于爬虫处理完成后回传的时候对数据进行签名
             this.tasks[taskIndex].token = this.generateTaskToken(this.tasks[taskIndex].id);
+            //任务处理次数计数
+            this.tasks[taskIndex].try_time ++;
+            //更新任务修改时间
+            this.tasks[taskIndex].updated = common.getTimestampInSeconds();
 
             //更新统计数据
             this.taskStatus.waiting --;
@@ -414,7 +415,7 @@ class HeroUnion {
     //定期检查爬虫是否在线
     //如果上一次上报状态时间在10分钟前，则设置该爬虫已下线
     heroHeartCheck() {
-        let _self = this;
+        const _self = this;
 
         const frequence = typeof(this.config.heroHeartCheckFrequence) != 'undefined'
                             && this.config.heroHeartCheckFrequence ? this.config.heroHeartCheckFrequence : 1;    //1 分钟检查一次
@@ -439,7 +440,7 @@ class HeroUnion {
 
     //自动重新加载配置文件
     autoReloadConfigs() {
-        let _self = this;
+        const _self = this;
 
         const frequence = typeof(this.config.reloadConfigFrequence) != 'undefined'
                             && this.config.reloadConfigFrequence ? this.config.reloadConfigFrequence : 5;    //5 分钟重新加载一次
@@ -456,7 +457,7 @@ class HeroUnion {
 
     //定期清理过期的任务
     autoCleanExpiredTasks() {
-        let _self = this;
+        const _self = this;
 
         const frequence = typeof(this.config.autoCleanTaskFrequence) != 'undefined'
                             && this.config.autoCleanTaskFrequence ? this.config.autoCleanTaskFrequence : 10;    //10 分钟检查一次
@@ -489,9 +490,45 @@ class HeroUnion {
         common.log('Cronjob of auto clean expired tasks started.');
     }
 
+    //定期重置处理过期的任务
+    autoResetRunningTimeoutTasks() {
+        const _self = this;
+
+        const frequence = typeof(this.config.autoResetWaitingTaskFrequence) != 'undefined'
+                            && this.config.autoResetWaitingTaskFrequence ? this.config.autoResetWaitingTaskFrequence : 6;    //6 分钟检查一次
+        const cronjob = cron.schedule(`*/${frequence} * * * *`, () =>  {
+            let timestamp = common.getTimestampInSeconds();
+
+            _self.tasks.forEach(function(item, index) {
+                if (
+                    item.status == 'running'
+                    && item.try_time < _self.task_max_try
+                    && timestamp - item.updated > _self.task_timeout
+                ) {
+                    _self.taskStatus.running --;
+                    _self.taskStatus.waiting ++;
+                    _self.tasks[index].status = 'waiting';
+                    common.log('Task %s running timeout, and reset it to waiting list', item.id);
+                }else if (item.status == 'running' && item.try_time >= _self.task_max_try) {
+                    //设置任务失败
+                    _self.taskStatus.running --;
+                    _self.taskStatus.failed ++;
+                    _self.tasks[index].status = 'failed';
+                    _self.tasks[index].error = 'Task max try time got.';
+                    common.error('Task %s failed, got the max try time.', item.id);
+                }
+            });
+        }, {
+            scheduled: false
+        });
+
+        cronjob.start();
+        common.log('Cronjob of auto reset expired running tasks started.');
+    }
+
     //定期尝试给已完成状态的任务notify_url发送通知回调
     autoNotifyTasks() {
-        let _self = this;
+        const _self = this;
 
         const frequence = typeof(this.config.autoNotifyTaskFrequence) != 'undefined'
                             && this.config.autoNotifyTaskFrequence ? this.config.autoNotifyTaskFrequence : 2;    //2 分钟检查一次
@@ -573,6 +610,7 @@ class HeroUnion {
         this.heroHeartCheck();
         this.autoCleanExpiredTasks();
         this.autoNotifyTasks();
+        this.autoResetRunningTimeoutTasks();
     }
 
 }
diff --git a/log/Readme.md b/log/Readme.md
new file mode 100644
index 0000000..de4d95f
--- /dev/null
+++ b/log/Readme.md
@@ -0,0 +1,3 @@
+# 系统日志保存目录
+
+用来保存任务提交记录等日志。
diff --git a/router_api.mjs b/router_api.mjs
index 5315b54..cceab20 100644
--- a/router_api.mjs
+++ b/router_api.mjs
@@ -106,7 +106,7 @@ router.post('/newtask/', async (req, res) => {
     }
 
     if (!data.message) {
-        data.task = heroUnion.createTask(uuid, url, platform, contract, data_mode, notify_url, country, lang);
+        data.task = await heroUnion.createTask(uuid, url, platform, contract, data_mode, notify_url, country, lang);
         data.code = 1;
         data.message = '新爬虫任务提交完成';
     }
diff --git a/test/common.test.mjs b/test/common.test.mjs
index 570199e..baca849 100644
--- a/test/common.test.mjs
+++ b/test/common.test.mjs
@@ -127,4 +127,16 @@ test('Common function byteSize test', async (t) => {
 
     let case5 = common.byteSize('hello 你');
     assert.equal(case5, 9);
+});
+
+test('Common function saveLog test', async (t) => {
+    let data = {a: 1, b:2};
+    let filename = './log/test.log';
+    let saved = await common.saveLog(filename, JSON.stringify(data));
+    assert.equal(saved, true);
+
+    //case 2
+    filename = './logs/test.log';
+    saved = await common.saveLog(filename, JSON.stringify(data));
+    assert.equal(saved, false);
 });
\ No newline at end of file