I've create a site in french language , now i wanna change the default language to English ,there is no possiblity from site settings , how can i do it ??
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You can't convert the base site from French to English, but you can enable the English language pack.
Go to Site Settings and click on language Settings and click English and click OK. You will need to do this for every site in your collection you want to have available in other languages.
This article should help you: http://sharepointchick.com/archive/2008/04/29/changing-the-language-of-an-existing-sharepoint-site.aspx