http://www.youtube.com/user/bbclearningenglish - Pronunciation Tips http://www.youtube.com/user/JenniferESL - English Pronunciation Lessons with JenniferESL Also look http://www.bbc.co.uk/worldservice/learningenglish/language/index.shtml

by imitating native english speaker's pronunciation.and practice it much

Hi there. There is a free online talking dictionary of English pronunciation. Just click over the pink words to hear them spoken www.howjsay.com/index.php?word.

Buy a pronounciation dictionary include CD of american english.

Hello Ahmadmemars, Beside the above mentioned advices you can also: - Record your own voice in English reading a certain text loudly and then check your mistakes and repeat the process from time to time to monitor your gradual improvement. - Use some English pronunciation checkers *you could find some soft wares online* to instantly correct your pronunciation. -Check some online websites to help you learn to pronounce correctly such as: http://www.lousywriter.com/language_pronunciation.php - Use chat voice facilities on different programs to chat with native speakers, listening to them speaking will help you catch the accent sooner or later. It should be part of your practice.Developing both your listening and speaking skills will help you improve the pronunciation. Good luck:)