The normal range of alanine aminotransferase is 0~40 U/L, when the patient’s alanine aminotransferase is 89 U/L, it is not serious. Alanine aminotransferase is produced by liver cells, when it is elevated, the main consideration is hepatitis, cirrhosis and other causes of impaired liver function, if alanine aminotransferase is 89 U/L, the main consideration is mild liver injury, causing liver cell destruction. However, alanine aminotransferase should be monitored regularly, and if there is a persistent increase, it is mainly considered that the destruction of liver cells is more serious, and the situation is more critical. In addition, when monitoring alanine aminotransferase, it is also necessary to regularly review the alanine aminotransferase, glutamic oxalate aminotransferase, etc., combined with other aminotransferases to comprehensively evaluate the function of the liver.