Acupuncture is mainly used for health preservation. "Song of Four Generals' Acupoints" said that "the abdomen stays three miles, the back is centered, the first item is missing, and the face is in the valley", which summarized the functions and indications of Zusanli, Weizhong, Lieque and Hegu in simple terms, and later generations added Neiguan. These five important acupoints have played an important role in health care.