In the past, the treatment for common bile duct stones was open common bile duct extraction, which is undoubtedly a very traumatic operation with many complications and long recovery time, especially for the critically ill and elderly. The introduction of ERCP technology (duodenoscopy) has opened up a more ideal way to treat common bile duct stones, which can be removed from the mouth without anesthesia and without opening the abdomen, and the stones can be removed immediately after surgery. EST (duodenal papillotomy) is mainly used for primary or secondary common bile duct stones and residual stones in the common bile duct after biliary surgery, and for acute obstructive purulent cholangitis caused by common bile duct stones, which is an indication, and the effect of emergency papillotomy for stone extraction is especially obvious.