下面就告诉大家具体的修改方法：
打开文件：include/ arc.archives.class.php文件，在里面找到如下代码：
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@SetSysEnv($this->Fields['typeid'],$this->Fields['typename'],$this->Fields['id'],$this->Fields['title'],'archives');
将上面的代码修改为：
$this->Fields['body'] = str_ireplace(array('altalt=""','alt=\'\''),'',$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']);
$this->Fields['imgurls'] = str_ireplace(array('altalt=""','alt=\'\''),'',$this->Fields['imgurls']);
$this->Fields['imgurls'] = preg_replace("@ [\s]{0,}alt[\s]{0,}=[\"'\s]{0,}[\s\S]{0,}[\"'\s] @isU"," ",$this->Fields['imgurls']);
$this->Fields['imgurls'] = str_ireplace("<img " ,"<img alt=\"".$this->Fields['title']."\" ",$this->Fields['imgurls']);
修改完成后保存，完成后生成一下所有文章就可以看看文章里面的图片是否有Alt属性了。