ERCP is the abbreviation, the full name is retrograde cholangiopancreatography, its indications are as follows: 1, jaundice caused by bile duct blockage; 2, if there are clinical symptoms, laboratory tests as well as imaging tests to determine that there is a problem with the pancreaticobiliary duct, including bile duct stones, biliary tumors, cholangitis, etc.; 3, pancreatic diseases: including chronic pancreatitis, pancreatic tumors, etc.; 4, unexplained pancreatitis, this case is to confirm the diagnosis of The cause of pancreatitis; 5, certain diseases can be done when biliary or pancreatic duct confirmatory pathology is needed, but the positive rate is not high because biliary duodenoscopy cannot enter the bile duct and pancreatic duct, so the disease can be done, but the positive rate is not high. All of the above are indications for ERCP, and if these diseases are found, ERCP can be done actively.