首页找到目录include/arc.archives.class.php：
//设置全局环境变量 $this->Fields['typename'] = $this->TypeLink->TypeInfos['typename']; @SetSysEnv($this->Fields['typeid'],$this->Fields['typename'],$this->Fields['id'],$this->Fields['title'],'archives');
修改为：
//替换图片Alt为文档标题
$this->Fields['body'] = str_ireplace(array('alt=""','alt=\\'\\''),'',$this->Fields['body']);
$this->Fields['body'] = preg_replace("@ [\\s]{0,}alt[\\s]{0,}=[\\"'\\s]{0,}[\\s\\S]{0,}[\\"'\\s] @isU"," ",$this->Fields['body']);
$this->Fields['body'] = str_ireplace("<img " ,"<img alt=\\"".$this->Fields['title']."\\" ",$this->Fields['body']);OK，修改过之后在更新生成下文章内容就可以了，方法其实很简单。