Abstract: Choice theory is developed during the practicing of reality therapy，by Willaim Glasser. It’s the foundation and core theory of all the work done by reality therapy instead of control theory. A very important idea of it is that ‘all we do from birth to death is behave and all we do is chosen.’ Choice theory modifies the concept of basic needs, quality world, and total behavior. It emphasizes internal control and choice. And it denies the concept of mental illness, and thinks much of the relationship. The article introduces the history of choice theory, expatiates on the main content and the application to counseling. At the end of the article, the author’s evaluation is given combining the Chinese culture and the author’s experience of counseling

Key words: choice theory, reality therapy, Glasser, internal control