找到\template\default\forum\viewthread_node.htm文件的78行<div class="avatar"{if !($_G['setting']['threadguestlite'] && !$_G['uid'])} onmouseover="showauthor(this, 'userinfo$post[pid]')"{/If}><a href="home.php?mod=space&uid=$post[authorid]" class="avtm" target="_blank">$post[avatar]</a></div>把其中的$post[avatar]改成<!--{avatar($post[authorid],big)}-->然后更新一下缓存就可以了