ERCP is the initials of the endoscopic retrograde cholangiopancreatography (EncoscopicRetrogradeCholangioPancreatography), that is, retrograde cholangiopancreatography under the duodenoscope, which is to insert the duodenoscope into the descending duodenum, find the duodenal papilla, insert a contrast catheter through the endoscopic biopsy orifice, and enter the papilla. If the pancreatic duct and bile duct are visualized at the same time or successively, it is called ERCP; if the contrast catheter is only inserted into the bile duct and only the bile duct is visualized by injecting contrast, it is called ERC (endoscopicretrogradecholangiography); if the contrast catheter is only inserted into the pancreatic duct and only the pancreatic duct is visualized by injecting contrast, it is called ERC (endoscopicretrogradecholangiography). If the contrast catheter is only inserted into the pancreatic duct and only the pancreatic duct is visualized, it is called ERP (endoscopicretrogradepancreatography). It is currently recognized as the gold standard for the diagnosis of pancreaticobiliary duct disease. On the basis of ERCP, interventions such as duodenal papillary sphincterotomy for bile duct stones, biliary ascaris removal (EST), endoscopic nasal bile drainage (ENBD), endoscopic internal bile drainage (ERBD) for acute cholangitis, acute biliary pancreatitis, obstructive jaundice, etc. can be performed, which are very popular among patients and their families because of no incision, little trauma, quick recovery and short hospital stay. It is very popular among patients and their families because it is non-invasive, less invasive, quick recovery and shorter hospitalization.