The majority of the liver is located at the right costal arch, with a small portion at the left costal arch, affixed to the underside of the diaphragm. Because of its rich blood supply, the liver is brownish-red in color, soft and brittle. The liver is mostly covered by the rib arch, so it is not easily accessible by hand during normal times. The liver is the largest digestive gland in the body and has four main functions: bile secretion, metabolism, defense and detoxification, and hematopoiesis. 1, bile secretion role: liver cells can continuously secrete bile, which can promote the digestion and absorption of fat in the small intestine. 2, carbohydrate metabolism: carbohydrates are the main source of calories produced by the body. After entering the digestive tract, grains and cereals are digested and hydrolyzed into glucose before being transported to the liver and absorbed and utilized by the body. After glucose is transported to the liver, a small portion is stored in the liver. 3.Protein metabolism: amino acids absorbed by the digestive tract are synthesized, deaminated and transaminated in the liver, and the synthesized proteins enter the blood circulation for the needs of organs and tissues throughout the body. 4.Lipid metabolism: the liver plays an important role in the digestion, absorption, decomposition, synthesis and transportation of fats. 5, vitamin metabolism: the liver can store fat-soluble vitamins, 95% of the body’s vitamin A are stored in the liver, the liver is vitamin C, D, E, K, B1, B6 and other vitamins storage and metabolism site. 6, hormone metabolism: under normal circumstances in the blood to maintain a certain level of various hormones, excess by the liver to deal with the loss of activity. 7, detoxification function: the liver is the body’s The liver is the main detoxification organ of the body, it can protect the body from damage, so that toxic substances become less toxic or soluble substances, with bile or urine out of the body. Most of the drugs are metabolized by the liver, and abuse can only increase the burden on the liver. In addition, the liver has defense functions, regulates the amount of blood circulation, produces clotting factors, generates heat, and has the ability to regenerate the liver.