"China Acupuncture Song" says: "If you want to be safe, Li Sanchang will not do it." This means that if you want to keep your body healthy and strong, you must always moxibustion Zusanli point. Zusanli point is located three inches below the lateral side of the kneecap and one finger on the lateral side of the tibia. Among the 360 acupoints in the human body, Zusanli is the first acupoint with health-care and health-preserving functions, which has the functions of strengthening the spleen and regulating the stomach, strengthening the body resistance, nourishing the body, eliminating diseases and prolonging life. Foreign medical circles also call this point Wei Baojian and Changshou. Therefore, pressing Zusanli point frequently can regulate the secretion of gastric juice, enhance the function of digestive system, improve human immune function and delay aging.