ERCP is the initials of Endoscopic Retrograde Cholangio-Pancreatography (ERCP), which is an endoscopic technique of injecting contrast agent through the duodenal papilla to retrograde the pancreaticobiliary duct, and is currently recognized as the gold standard for diagnosing pancreaticobiliary duct disease. On the basis of ERCP, interventions such as duodenal papillary sphincterotomy (EST), endoscopic nasal bile drainage (ENBD) and endoscopic internal bile drainage (ERBD) can be performed, which are popular among patients because they do not require incision, are less invasive and have a much shorter hospital stay.