在主题的index.php文件中插入:

<?php
$sticky = $this->options->sticky; //置顶的文章cid，按照排序输入, 请以半角逗号或空格分隔
if($sticky && $this->is('index') || $this->is('front')){
$sticky_cids = explode(',', strtr($sticky, ' ', ','));//分割文本 
$sticky_html = "<span>[置顶]</span>"; //置顶标题的 html
$db = Typecho_Db::get();
$pageSize = $this->options->pageSize;
$select1 = $this->select()->where('type = ?', 'post');
$select2 = $this->select()->where('type = ? && status = ? && created < ?', 'post','publish',time());
//清空原有文章的列队
$this->row = [];
$this->stack = [];
$this->length = 0;
$order = '';
foreach($sticky_cids as $i => $cid) {
    if($i == 0) $select1->where('cid = ?', $cid);
    else $select1->orWhere('cid = ?', $cid);
    $order .= " when $cid then $i";
    $select2->where('table.contents.cid != ?', $cid); //避免重复
}
if ($order) $select1->order(null,"(case cid$order end)"); //置顶文章的顺序 按 $sticky 中 文章ID顺序
if ($this->_currentPage == 1) foreach($db->fetchAll($select1) as $sticky_post){ //首页第一页才显示
    $sticky_post['sticky'] = $sticky_html;
    $this->push($sticky_post); //压入列队
}
$uid = $this->user->uid; //登录时，显示用户各自的私密文章
if($uid) $select2->orWhere('authorId = ? && status = ?',$uid,'private');
$sticky_posts = $db->fetchAll($select2->order('table.contents.created', Typecho_Db::SORT_DESC)->page($this->_currentPage, $this->parameter->pageSize));
foreach($sticky_posts as $sticky_post) $this->push($sticky_post); //压入列队
$this->setTotal($this->getTotal()-count($sticky_cids)); //置顶文章不计算在所有文章内
} ?>

在列表的 <?php $this->title() ?> 的前面插入 <?php $this->sticky() ?>

最后在 functions.php 的文件里插入设置框

$sticky = new Typecho_Widget_Helper_Form_Element_Text('sticky', NULL,NULL, _t('文章置顶'), _t('置顶的文章cid，按照排序输入, 请以半角逗号或空格分隔'));
$form->addInput($sticky);

这样以后再置顶主题就会方便很多了