SEO error causes the website to descend the reason analysis

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I am the personal webmaster who shares and discovers. Some time ago GG, Baidu included have been very good, but recently found that most of the traffic to share and found to Baidu, to Google traffic is quite small, and a long time to be included, only the home page, has not found the site included why the reason for the decline, Do not know is because of SEO error operation caused. Hope the master Help analysis.

This is Google's latest collection

This is the penultimate collection.

Two results showed that the site included a decrease of the excitation interval of about 15 days.

After careful sharing and discovery analysis, find the following questions, do not know which is the most direct cause of the site included down

Recent Web site issues:

Check with Google Webmaster tools and find a few Google Bugs:

1. Content analysis meta-label repeat page 4, the META tag is too short 16.

2.HTTP error (0) URL error in Sitemap (0) cannot find (5) unreachable URLs (1)

3. My robots have not been set up, do not know will not produce a lot of similar web pages.

Human reason:

1. The title was modified three times in the previous period of January.

2. Because of the change of the server human error, resulting in a Web site can not visit the day

Share and find August points online, and most of the articles are original, should be included in the site should not be the result. So specially wrote this post hope the master helps to find the reason.