Man is a species in nature, and everything in the world has its own way. Tao is "the law of nature". "Health preservation": it should be "nurturing" and "living" refers to life. That is: save life and ensure health until the end of life. "Health-keeping" is a knowledge, which can be said to run through a person's life, from "choosing a baby to the end of the year", including "walking, sitting, eating, drinking, sleeping, emotional habits, living environment, working environment, yin and yang, qi and blood essence, including psychological activities, etc. These are closely related to people's lives. " Therefore, health practitioners should not be partial, listen more and listen more, be knowledgeable and choose well, which is the best for them. There are endless names of diseases, endless prescriptions, countless health preserving techniques, and endless TCM therapies.