Liver function test is mainly through blood sampling, which is a method to test various indicators related to liver function and metabolism through various biochemical experiments, and it can reflect the basic status of liver function. The nine liver function tests mainly include glutathione aminotransferase, glutamic oxaloacetic aminotransferase, glutamyl transpeptidase, alkaline phosphatase, total bilirubin, direct bilirubin, indirect bilirubin, total protein and albumin. Among them, glutamyl transaminase and glutamic oxalacetic transaminase are very sensitive indicators of hepatocyte necrosis, which can help to diagnose and differentiate whether and to what extent hepatocytes are necrotic in clinical practice. Glutamyl transpeptidase, alkaline phosphatase, total bilirubin, direct bilirubin, and indirect bilirubin are clinically useful in the differential diagnosis of hepatocellular jaundice, obstructive jaundice, and hemolytic jaundice. Total protein and albumin are mainly synthesized by the liver, and it mainly reflects the synthesis status of the liver.