i have my green card . but 6 years ago they denies me to be american citizen cause i divorced my ex husband before 2 years of marriage . can i still

There is not enough information in your question to give you an answer, but generally if you file for naturalization based on marriage to a U.S. citizen you have to prove you have been living with that U.S. citizen for the 3 years prior to your application. If your marriage was legitimate you may qualify for citizenship based on the 5 year rule. You should contact an attorney to review the prior denial to best advise on your case.    Karen Weinstock Siskind Susser P.C. 404-592-2085