Will a large number of 404 pages reduce the weight of the site?

Today to tell you about the site 404 pages on the impact of the site; changes in the site and the structure of the revision, the deletion of the article we often encounter such a problem: access to delete the article or article column changed to will appear 404 pages, shopping malls and other sites after the shelves will produce 404 pages, Then over time the site will be more and more 404 pages, the return of 404 pages will affect the weight of the site?

With this question I searched Baidu on a bit, most said 404 pages will produce a bad effect, is the weight of the site down, the rankings fell such as some of the answers, are the so-called SEO talent said, has not been confirmed by Baidu official.

So in my own website revision and change the theme I will be the entire station of the article has been deleted, delete after adding some new articles up, about one months or so, the keyword appeared in some rankings, the original keyword or have ranked articles in one months also disappeared, this is a large number of 404 pages caused it? So I seek official confirmation: Fee Dickens in Baidu to find the official answer: (Q for users of the problem; A for Baidu search product colleague's answer)

A: I have a mall class site, because it will often produce a large number of shelves of goods, the production of the next product, the program will return a template only empty page, no specific commodity information. Before I put these shelves of goods on the page set to 404, in the log to see a large number of 404 status Code, I would like to ask if this will affect the quality of my site, long-term continue to cause the collection and ranking down?

Q: We encourage the webmaster to return the specification for dead chain 404 code, not welcome to the dead chain return 200 code. As long as the correct return of 404, no impact on the site, but also can reduce the Baiduspider crawl to the server caused by the burden. If the number of dead chain is more, it is recommended to submit dead chain list through webmaster platform, more efficient.

Baidu's official answer can be confirmed: a large number of 404 pages will not affect the weight of the site! So why is there a change in weight? I think there are two reasons for this:

1. Site column address change or delete a large number of articles, then the search will be included in the fall.

2. The new content of the website affects a certain keyword density of the website or a page that has the rank can't access

There are two aspects, the site's traffic will have a certain decline, and some even fall very serious, so the illusion is that the weight of the site dropped, careful analysis is not, in fact, as long as the correct return of 404, no impact on the site. This article by the Wubi Word root table pithy http://www.wubilx.cn/provides, reprint please indicate the source! To do the station is to fight patience and diligence, pay their greatest efforts will be able to achieve the desired results! I wish you all success!