However nobody knows why Google makes Sitelinks for some websites ans why it doesn’t make for others, i guess some parameters are important for having Sitelinks in Google and they are Pagerank and traffic.
I want to know other parameters that you know to have Sitelinks in Google?
Off Topic:
bestseo, do you actually read replies to your threads? In another one I made you aware of the SEO subforum and told you that these type of questions are better suited there.
Sitelinks are not the same as backlinks.
Before I spend more time writing things that nobody will read, here are links to useful articles regarding sitelinks:
http://www.seopedia.org/internet-marketing-and-seo/google-sitelinks-the-ultimate-faq/
http://www.seobythesea.com/?p=406
http://www.davechaffey.com/SEO-Best-Practice/Google-Site-Links
Well i guess nobody knows exactly about google sitelinks because it doesn’t tell actual backlinks but yahoo is the best to check actual backlinks 
If you check out Google Webmaster Tools and you don’t have any you’ll see something like
Sitelinks are links to a site’s interior pages. Not all sites have sitelinks. Google generates these links automatically, but you can remove sitelinks you don’t want.
… <example SERP display> …
Google has not generated any sitelinks for your site.Sitelinks are completely automated, and we show them only if we think they’ll be useful to the user. If your site’s structure doesn’t allow our algorithms to find good sitelinks, or we don’t think that the sitelinks are relevant to the user’s query, we won’t show them. However, we are always working to improve how we find and display sitelinks.