Abstract: Expert witnesses are correlative experts who provide scientific written report and give directly testimony on the court with professional knowledge and technology at the require of court. Expert psychological witnesses are psychologists who stand on the court and give the testimony. British and American law system is very different from continental law system which is mainly used in our country. This article intents to open a new eyesight for national law area and psychology area by introducing the history、the working process、the controversy and the existed experimental researches of expert psychological witnesses of British and American law system, and also intent to explore the possibility of applying Expert psychological witness for our country law system

Key words: expert witnesses, British and American law system, Continental law system, expert psychological Witness