只要在include aglibchannel.lib.php   

找到下面黑色代码,加入下面红色代码 description,即可

位置在78行

 if($type=='top')

    {

        $sql = "SELECT id,typename,description,typedir,isdefault,ispart,defaultname,namerule2,moresite,siteurl,sitepath

          From `dede_arctype` WHERE reid=0 And ishidden<>1 order by sortrank asc limit 0, $line ";

    }

    else if($type=='son')

    {

        if($typeid==0) return '';

        $sql = "SELECT id,typename,description,typedir,isdefault,ispart,defaultname,namerule2,moresite,siteurl,sitepath

          From `dede_arctype` WHERE reid='$typeid' And ishidden<>1 order by sortrank asc limit 0, $line ";

    }

    else if($type=='self')

    {

        if($reid==0) return '';

        $sql = "SELECT id,typename,description,typedir,isdefault,ispart,defaultname,namerule2,moresite,siteurl,sitepath

            FROM `dede_arctype` WHERE reid='$reid' And ishidden<>1 order by sortrank asc limit 0, $line ";

    }

然后即可调用：

例如：

{dede:channel type='son' typeid='21'}

<p>[field:description/]</p>

{/dede:channel}