"Health preservation" refers to a medical activity that supports life, strengthens physique and prevents diseases through various methods, so as to achieve longevity. The so-called life is life, survival and growth; The so-called maintenance means maintenance, recuperation and nourishing. In a word, keeping in good health is to maintain life. Guided by the theory of traditional Chinese medicine, we should follow the changing law of the biochemical set of Yin-Yang and Five Elements to scientifically recuperate human health and vitality. Psychological health preservation refers to the method of nourishing the heart, regulating the mood and life, so as to achieve the purpose of maintaining the body, reducing diseases, improving health and prolonging life.