1, you added a domain name to be ?
Sometimes the search engine is very heavy to resist the assumption that in order to optimize the weight to the case, rather than use the 301 to 302. If the appropriate weight to the case, this will be a very important tool.

2, do you have a certain number of meaningful link it ? Or your link strategy is “today, tomorrow,” but it ? If you use this strategy it will be achieved or good results. But if you added too many links to your site built by the small, or too many links to the same one URL. Then you have the opportunity to be a search engine penalties. As the search engine algorithm in continuous improvement, the previously applicable to things today, or is no longer applicable.

3, and if you cheat the site is a link ?

4, it is due to copy the contents of punishment? ? Some examples are as follows:
A. use the entire site with a template;
b. the use of other sites with the same template;
C. your competitors mirror your site;
d. from an old domain name redirected to a new domain names under.
e. excessive dependence on robot.txt to guide the spider to include your site;

5, whether or not to use cloaking to fool the search engine ?

6, your site is in some large sites on advertising, and has recently removed the ads ?
In some advertising on the site, especially the text ads. This is conducive to improving the ranking of your site. Once, links removed, then the ranking will naturally decline.