Google ranking dropped

[farm gate]

Keyword in Google ranking dropped? Recently I am study the problem, because I several web sites have also been Google K off. Below I summarize a, website links, there are a lot of change, because a lot of website, I was unidirectional import, cause this website output link too much, also can cause Google website ranking dropped. Second, the website content relevance, recently, I due to busy, have been looking for and site title irrelevant content in the update content, may be this is also one of the reasons. Three, recently, has been in the webmaster BBS post, reattachment, may cause a single website links too much...