找到文件：source\module\portal\portal_view.php
找到如下代码

$article['related'] = array();
if(($relateds = C::t('portal_article_related')->fetch_all_by_aid($aid))) {
    foreach(C::t('portal_article_title')->fetch_all(array_keys($relateds)) as $raid => $value) {
        $value['uri'] = fetch_article_url($value);
        $article['related'][$raid] = $value;
    }
}

修改成

$article['related'] = array();
if(($relateds = C::t('portal_article_related')->fetch_all_by_aid($aid))) {
    foreach(C::t('portal_article_title')->fetch_all(array_keys($relateds)) as $raid => $value) {
        $value['uri'] = fetch_article_url($value);
        $article['related'][$raid] = $value;
    }
    shuffle($article['related']);
}