织梦伪静态将tag标签的url设置成id的方法：
1、在网站根目录下的tags.php中18行找到：

if(isset($tags[2])) $PageNo = intval($tags[2]);

在其下方加入代码：

$tagid = intval($tag);
if(!empty($tagid))
{$row = $dsql->GetOne("SELECT tag FROM `#@__tagindex` WHERE id = {$tagid}");if(!is_array($row)){ShowMsg("系统无此标签，可能已经移除！","-1");exit();}else{$tag = $row['tag'];define('DEDERETAG', 'Y');}
}
else
{$tag = '';
}

2、/include/taglib/tag.lib.php 87行找到：

$row['link'] = $cfg_cmsurl."/tags.php?/".urlencode($row['keyword'])."/";

将其替换成：

$row['link'] = $cfg_cmsurl."/tags/".$row['id'].".html";

3、/include/arc.taglist.class.php 458行找到：

$purl .= "?/".urlencode($this->Tag);

将其替换成：

if(!defined('DEDERETAG'))
{$purl .= "?/".urlencode($this->Tag);
}

继续在这个文件里找到：

return $plist;

在其上方加入代码：

if(defined('DEDERETAG')){$plist = preg_replace('/_(d+).html/i','.html',$plist);$plist = preg_replace('/.html/(d+)//i','_\1.html',$plist);$plist = str_replace('_1','',$plist);}

4、tag 标签伪静态规则，请根据自己所使用的服务器环境选择对应的规则.
.htaccess (Apache)

RewriteEngine On
RewriteBase /
RewriteRule ^tags.html$	tags.php
RewriteRule ^tags/([0-9]+).html$	tags.php?/$1 [L]
RewriteRule ^tags/([0-9]+).html$	tags.php?/$1/
RewriteRule ^tags/([0-9]+)_([0-9]+).html$	tags.php?/$1/$2
RewriteRule ^tags/([0-9]+)_([0-9]+).html$	tags.php?/$1/$2/

Nginx

rewrite ^/tags.html$	/tags.php;
rewrite ^/tags/([0-9]+).html$	/tags.php?/$1;
rewrite ^/tags/([0-9]+).html$	/tags.php?/$1/;
rewrite ^/tags/([0-9]+)_([0-9]+).html$	 /tags.php?/$1/$2;
rewrite ^/tags/([0-9]+)_([0-9]+).html$  /tags.php?/$1/$2/;

web.config (iis7 iis8)

<rule name="tag首页"><match url="^tags.html$" ignoreCase="false" /><action type="Rewrite" url="tags.php" appendQueryString="false" />
</rule>
<rule name="tag列表"><match url="^tags/([0-9]+).html$" ignoreCase="false" /><action type="Rewrite" url="/tags.php?/{R:1}" appendQueryString="false" />
</rule>
<rule name="tag列表最后有左斜杠"><match url="^tags/([0-9]+).html$" ignoreCase="false" /><action type="Rewrite" url="/tags.php?/{R:1}/" appendQueryString="false" />
</rule>
<rule name="tag列表分页"><match url="^tags/([0-9]+)_([0-9]+).html$" ignoreCase="false" /><action type="Rewrite" url="/tags.php?/{R:1}/{R:2}" appendQueryString="false" />
</rule>
<rule name="tag列表分页最后有左斜杠"><match url="^tags/([0-9]+)_([0-9]+).html$" ignoreCase="false" /><action type="Rewrite" url="/tags.php?/{R:1}/{R:2}/" appendQueryString="false" />
</rule>

5、后台TAG标签管理里的TAG链接修改为伪静态(非必需，根据需要修改)

在/dede/templets/tags_main.htm文件89行找到：

<a href="../tags.php?/<?php echo urlencode($fields['tag']); ?>/" target="_blank">{dede:field.tag /}</a>

将其替换为：

<a href="../tags/{dede:field.id /}.html" target="_blank">{dede:field.tag /}</a>

注：以上默认为PC站tag标签伪静态，将tag标签的URL链接修改id.html的方法