::Identify used keywords
Keywords phrases within a Web page are among the most important factors to achieving top ranking on search engine .
it needs to pay attention closely and chosen as much relevant to site business as possible ,while analyzing the issue that keywords phrases should bring high qualify visitors to site.
List the primary keywords that pertain to this page.
Put the most important words at the beginning of the tag.
If you don't use your keywords within the viewable text of the page, then just adding them to the Meta keywords tag is very unlikely to help with rankings for those keywords. However, some use the Meta Keyword tag as a place to put alternatives or misspellings of their keywords even though they are not on the viewable text. It is not clear whether this helps or not, but it won’t hurt.
Don't use this tag to “stuff” or repeat keywords. This doesn't help and could hurt with some search engines.
The optimal number of keywords should be between 7 and 48 words.