Health preservation is a health care activity to maintain the body, reduce diseases, improve health and prolong life according to the law of life development. The word "keeping in good health" first appeared in the chapter of Zhuangzi. The so-called life is life, survival and growth; The so-called maintenance means maintenance, aftercare, aftercare, nourishing and aftercare. Health preservation is a comprehensive activity to strengthen the body and prolong life by nourishing the mind, regulating diet, exercising, having sex carefully and adapting to cold and temperature. Under the guidance of TCM theory, TCM health preservation is a practical science that explores and studies the traditional theories and methods of health care, physical fitness, disease prevention and longevity in China, and uses this theory and method to guide people's health care activities. The theory of health preservation is guided by the theory of traditional Chinese medicine, absorbs the essence of each family and puts forward a series of health preservation principles. Supplementing physical and mental nutrition, coordinating yin and yang, conforming to nature, paying attention to diet, living cautiously, harmonizing viscera, dredging meridians, abstinence, nourishing essence, benefiting qi, regulating breath, etc., so that health-keeping activities can be followed by rules and laws.