ERCP (Endoscopic Retrograde Cholangiopancretography) is endoscopic retrograde cholangiopancreatography. This technique has been developed from a purely diagnostic technique to a comprehensive treatment-based technique, which mainly includes: cholangiopancreatography; duodenal papillary sphincter dissection and dilation; bile duct and pancreatic duct stone lithotomy and extraction; bile duct and pancreatic duct stricture dilation; nasobiliary duct and nasopancreatic duct drainage; bile duct stent and pancreatic duct stent placement and drainage; radiofrequency ablation of biliary malignant obstruction. The main indications for ERCP are: 1. bile duct stones, tumors, inflammation, parasites; 2. recurrence of symptoms after cholecystectomy, bile duct surgery, unexplained obstructive jaundice; sphincter of Oddi’s dysfunction; 3. recurrent pancreatitis, biliary pancreatitis, chronic pancreatitis, pancreatic tumors; 4. congenital malformations of bile and pancreas, bile-pancreatic duct confluence abnormalities; 5. Surgery, post-traumatic biliary fistula, pancreatic fistula, stricture; 6. Duodenal papilla, jugular abdominal tumor. Contraindications include 1. severe cardiopulmonary or renal insufficiency; 2. acute pancreatitis or acute attack of chronic pancreatitis (except biliary origin); 3. allergy to iodine contrast agent. The advantages of this minimally invasive treatment technology are: 1. minimally invasive, less painful for the patient, and can be completely cured without surgical open surgery; 2. mature technology, high success rate, and few complications; 3. short treatment time, low cost, and fast recovery: after the operation, you can go down to the floor and resume eating and drinking the next day, and generally only need to be hospitalized for 3 to 5 days, and the treatment cost and hospitalization time are 1/2 to 1/3 of traditional surgery; 4. 4. wide range of indications, not subject to the restrictions of adhesions of the common bile duct after multiple surgeries and old age and frailty, ERCP technology reduces the risk of treatment and is more conducive to patient recovery.