In the early stage of acute pancreatitis, blood amylase is often rechecked for diagnosis. Blood amylase starts to rise gradually within a few hours after the onset of acute pancreatitis, and the value of blood and urine amylase reaches the highest level within 24 hours, and gradually starts to decline, and blood amylase starts to return to normal in about 3-5 days. For patients with acute pancreatitis, the initial screening can be done simply by blood amylase when symptoms are detected in the early stages. When screening for acute pancreatitis, it is also necessary to exclude elevated blood amylase caused by peptic perforation cholecystitis, stress ulcer, etc. It is also necessary to combine ultrasound, CT and blood lipase of the pancreas to make the diagnosis. After 5-10 times increase in blood amylase is considered acute pancreatitis, early medication should be administered to avoid delaying the disease.