ALP is the alkaline phosphatase enzyme in liver function tests. Generally alkaline phosphatase is at normal values. However, if the patient is mildly elevated, it is not necessary to treat this condition once in a while, just continue to observe. Note that patients should have their liver function checked again in 1-2 months to see how the alkaline phosphatase value has changed. If it has become normal, continue to observe and do not treat. However, if it becomes abnormal more than twice, consider whether the patient has other diseases of the liver, such as whether the patient has an acute phase of fatty liver, whether the patient has viral hepatitis, and whether the patient has biliary obstruction that causes liver function impairment after the patient has biliary stasis. If the alkaline phosphatase is combined with elevated bilirubin, especially total bilirubin and direct bilirubin, and combined with elevated GGT and elevated glutamic acid and glutamic oxalacetic aminotransferase. In this case, the patient is usually considered to have obstructive jaundice due to obstructive factors, which may also cause an increase in alkaline phosphatase. Patients need to actively pay attention to liver preservation therapy and further investigate the cause of biliary obstruction, whether it is a stone or tumor disease. If necessary, ERCP will be performed to retrieve the stone and further investigations.