Choledochal stones can be embedded in the opening of the pancreatic duct downward, therefore, stone removal treatment is not recommended for lower choledochal stones, including common bile duct and gallbladder stones, which can be treated by surgical laparoscopic or transoral endoscopic ERCP. The lower bile duct stones are called bile duct pancreatic segment stones from the anatomical classification point of view, natural stone removal is not recommended because the pancreatic segment stones are within the pancreas, if the stones continue to go down to the opening of the intestinal tract, that is, the duodenal jugular, the jugular is the confluence of bile duct and pancreatic duct, once the bile duct stones are stuck from the lower part of the pancreas and then down to the jugular, not only the bile duct but also the pancreatic duct can be blocked, which is clinically This is the anatomical basis for the occurrence of biliary pancreatitis.