The mechanism of qigong fitness and rehabilitation, that is, qi function to eliminate diseases and strengthen the body, is more effective for chronic difficult diseases, especially psychosomatic diseases. However, qigong rehabilitation is different from clinical treatment. It does not aim at the cause or focus, but enhances the self-regulation function of the body and stimulates its self-healing ability, thus achieving the purpose of getting rid of diseases and strengthening the body. Qigong rehabilitation pays attention to the role of social environment and personal psychology, which is more in line with the new health concept and new medical model.