Flex SEO (Search Engine Optimization) allows browsers to find your Flash site

Search engine optimistation is to make your site information "Search Engine" (Google, Baidu ...) Search. There are two general Seo categories: white hats and black hats. In short, black hats is a cheating method. For example, adding a bunch of duplicate keywords to the meta tag is an attempt to search for the search engine, if the search engine finds that you are using this method, your site information may be temporarily or permanently blocked by the search engine.

I. meta tag
You can add meta tags on the HTML page where your flash is located. This is a location that the search engine will search:
<Meta name = "keywords" content = "Adobe, Flash, Flex"/>
<Meta name = "Description" content = "this site most talk about flash, flex and ActionScript."/>
There are other meta tags, such as pics-label, Dublin Core, and rating.

Ii. Add meta tags to flash
If you are using the Adobe Flash development environment, Add Tag Information in the title and description in document properties (modify> docuemnt ).
, The information will be compiled into your flash,

3. Use swfobject
Swfobject is a Javascript file used to embed SWF, I do not understand JS, so the specific method see: http://blog.deconcept.com/swfobject/

4. Add the SWF meta tag to flex:
You can add information to project-properties-Flex compiler-Additional compiler arguments,