The normal value of glutamate transferase, known clinically as glutamate aminotransferase and abbreviated as ALT in liver function, is between 0 and 40 U/L. Glutamate aminotransferase is considered normal when it is within this range. If there is an elevation of ALT between 40-80 U/L, functional liver impairment is considered, such as drinking alcohol, staying up late, being tired, taking medication, being depressed or eating too much fatty food before liver function tests, which can cause transient liver impairment. In this case, patients are advised to change their daily habits and take appropriate medications to lower transaminases. If glutamate aminotransferase is above 80 U/L, consider whether there are other liver diseases, such as viral hepatitis, autoimmune hepatitis, or biliary obstruction, and conduct relevant examinations to further clarify the diagnosis, including upper abdominal ultrasound and upper abdominal MRI to determine the cause of elevated aminotransferase, and provide etiological treatment and liver protection according to different causes. The treatment should be based on the cause and liver protection.