Liver function is a reflection of the physiological functions of the liver, and liver function tests are performed to detect the presence of liver disease, the degree of liver damage, as well as to identify the cause of liver disease, determine the prognosis and identify the cause of jaundice. Several representative indicators are often selected to understand liver function, such as protein metabolism function test, bilirubin metabolism function test, liver dye excretion test and various serum enzyme tests. These include bilirubin, albumin, globulin, ghrelin and glutamyl transaminase, glutamyl transpeptidase, blood ammonia, and clotting time. Liver function tests are especially sensitive and important for the determination of liver diseases such as hepatitis, cirrhosis and other diseases. When these lesions are present, they first affect the metabolic, immune and synthetic functions of the liver, making these and their sensitive indicators manifest in the liver function test. At the same time, liver function tests also have certain limitations. Liver function tests can only be used as an aid in diagnosing diseases of the hepatobiliary system, and some indicators may also be elevated in the case of other diseases. When evaluating the results of liver function tests, it is important to consider liver function in the context of clinical symptoms to avoid one-sidedness and subjectivity.