对于大型网站来讲，流量都是以万起头的，但是任何网站都不免因为业务的需要，或者说系统的升级，而不得不对网站进行改版。如何正确的改版不让不让网站出现损失，或者说将损失降到最低呢?尤其是对于大型网站来讲，是一个慎重且严谨的问题。今天这篇文章，贺贵江这里就做几个典型的改版指导。
一：更换模板的改版
网站改版中，更换模板是属于最为常见的一种改版，这种改版按照正常的情况是不会有任何风险的，但是却仍旧有一些网站出现了问题，那么是什么情况呢?
第一种情况：网站模板本身存在较多优化问题，而导致网站整体并不利于优化，要知道搜索引擎看的就是网站前端，如果前段优化不如之前，排名自然的被向后推移。
第二种情况：内链布局出现问题，简单的说：某个页面产生排名是因为全站点为其赋予了足够的内链权重，但是在新的模板中，这个权重消失了，那么还会产生排名吗?
更换模板的改版是最为简单的，但对于大型网站来讲模板越复杂，面对的风险也就越大，SEO处理不完善的模板，请不要将其放到程序上，一旦放上去，就不要做修改了!另外，更换完模板后，还要进行404的监测，可以通过百度站长工具，或者LOG日志来查看。
二：更换程序的改版
有一些网站建设的时间非常早，前段时间就有一家网站来做 SEO诊断，网站做了有十多年，但是还是最为基础的ASP，甚至都是动态链接，系统功能也非常弱，基本的不同栏目标题设置都不支持。所以，需要在SEO诊断的同时，也需要做一次更换程序的改版(他的网站收录30多万)。
对于他这个改版，是ASP程序，更换为PHP程序，如何操作呢?我们建议的是在当前站点上直接套一个PHP程序，然后将全部栏目页均301重定向到新的栏目页上。同时，之前的内容禁止删除，之前的内容页基本禁止再放到新的程序上。这个站长曾经将全站的数据，继续采集到PHP站点上面，是完全错误的，哪怕可以做301，仍旧不合适!你知道吗?
上面是一种形式的改版，是同一类型的语言，且会造成大量的目录和结构的冲突根本无法避免，这样的如何操作呢?可以将老站点做到新的子域名中，之后301即可!这种的损失相对来讲，也是最大的，重要的还要站长平台中做好网站改版规则的提交哦!
三：系统升级的改版
除了更换模板，系统升级的改版是站长操作最多的了，比如：增加一个模块、做一个新的功能，都属于系统方面的升级。然而，就是这样的升级，都会让一些网站产生问题。
在2015年底的时候，笔者诊断过一个网站，之后这个站点进行了一次系统的升级，结果导致收录在一个星期就暴增了两百万!什么原因造成的?新的升级程序升级将优化后的robots.txt给覆盖了!这是一个非常严峻的问题，200W垃圾页面的收录，对网站的影响是极大的!
对此我们要说的是：网站无论如何做升级，都要记住一点：如果有覆盖性的升级，一定要检查好哪些东西是可以覆盖的，哪些是不可以覆盖的。
还有一些系统的升级是如模块的增加，功能的开发会产生一些新的页面出来，这样的升级更应当提前评估：新的页面是否符合搜索引擎规则，新的页面是否已经有足够的信息来完善这个页面，满足用户的需求，并不仅仅是一个框架。
除此外，系统升级的改版更要密切关注搜索引擎的抓取频次、以及测试抓取是否可以快速联通，是否会因为页面太大而造成抓取缓慢等一系列的问题。
最后有一个非常重要的说明：网站流量越大，收录数据量越多，改版更应当重视有一个原则：只要没问题能不改则不改，只做必要的问题修改，其他的修改则留到网站发展瓶颈的时候再做完善!为什么有的网站做的越完善，排名反而越糟糕呢?是因为修改的太频繁啊，但是自身却没有认识到这个问题!
A5营销( http://www.admin5.cn/seo/zhenduan/)手把手教你做网站优化，系统的解决方案，让网站优化一步到位，点击一下，即刻拥有!
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