is there any way to control "Refresh Rate"???

You mean the framerate? You can use fps_min and fps_max.

thanx any way,but no man i meant(screen refresh rate).

To my knowledge, No. It is managed by the video-card driver.

But if you look into using API's (advanced lite-c) then the
"ChangeDisplaySettings" in User32.dll MAY help out...

thanx for you'r reply,i know that but i think conitec should make such a feature easy to accessible,without using any external API's.
games such as call of duty series uses this feature in the game,which i thing is very important because not all people uses LCD screens.

Using API's isnt that hard, and Conitec have made using API's quite easy.

I use API's a LOT, but using the "ChangeDisplaySettings" API is one I havent tried.

You generally would not want to change user's monitor's refresh rate. Since most LCD panels always and mostly ONLY runs on either 59hz or 60hz

or 75 or 120 Hz (i like my syncmaster)

...if you are in the fullscreen modus. Only then the fps is set to the monitor frequency. In windowed mode there is no fps limit. You can set the max fps in both mode with
fps_max = 30;

you most be talking about LCD monitors,i said before no all people got lcd's,some of them still uses CRTs,(and iam one of them,i hate lcd),the CRT refresh rate goes from 60 to 120. that's the problem.