Make the chain construction work
 

For keywords ranking do auxiliary function. The chain construction should pay attention to rich and high quality ***. In fact, the chain type many, including trade platform, classification information, bookmarks, soft wen submission, BBS and baidu of related resources and so on. Although the chain number, but if there is no high quality external chain resources, site's ranking will still influential, so be sure to pay attention to the construction of the chain.