if i entered a marriage in good faith,and idid't get my citizenship because my marriage fail,how long do i have to wait to get it?

Are you already a lawful permanent resident? If so, you may apply for naturalization once you have been a green card holder for five years. The application may be filed up to 90 days in advance of your fifth anniversary. You can read more about naturalization at http://myattorneyusa.com/how-to-get-naturalized-in-the-united-states.