Tauroursodeoxycholic acid is the main effective component of bear bile and also the main component of synthetic bear bile. It is a conjugated bile acid that widely exists in human and various animal bile and has a variety of physiological and pharmacological effects. This drug and its preparations have 20 years of clinical experience in marketing abroad, and are mainly used for steroidal gallbladder chemobooks stones, cholestatic liver diseases (such as primary biliary cirrhosis), bile reflux gastritis, autoimmune hepatitis (AIH), primary biliary cirrhosis (PBC), and primary sclerosing cholangitis (PSC C). Chronic hepatitis (hepatitis B, hepatitis C, etc.), alcoholic fatty liver, non-alcoholic fatty liver, drug-induced liver damage, prevention and treatment complications before and after liver transplantation.