1, The disease can be completely cured by duodenoscopy without other surgical treatment, such as various types of extrahepatic bile duct stones, biliary ascariasis, and papillary sphincter stenosis. 2, gallbladder stones secondary to common bile duct stones or papillary sphincter stenosis, after endoscopic treatment to exclude the stones in the common bile duct or release the sphincter stenosis, and then perform cholecystectomy, it is not necessary to do common bile duct exploration and stone extraction or oddi sphincter molding, and also eliminates the “T” tube drainage. For acute obstructive purulent cholangitis, acute biliary pancreatitis, obstructive jaundice caused by periampullary tumor, etc., endoscopic treatment can rapidly achieve clinical cure of acute obstructive purulent cholangitis, unblock the bile ducts and drain the pancreatic ducts in acute biliary pancreatitis, and reduce clinical symptoms, and further clarify the cause of the disease through endoscopic diagnosis to create conditions for the next treatment. Create conditions for the next treatment. 3.As a supplementary treatment after surgery. After biliary tract surgery, residual bile duct stones and papillary sphincter stenosis can be treated by endoscopy. 4.”Two-scope” combined treatment of cholelithiasis. In other words, the stones in the common bile duct are removed by electronic duodenoscopy first, and then the gallbladder with multiple stones is removed by TV laparoscopy. Patients with obstructive jaundice, common bile duct stones and gallbladder stones are diagnosed by ultrasound and ERCP examination. Traditional surgery involves open excision of the gallbladder, opening the common bile duct to remove the stones, and placing a “T” shaped tube for drainage for more than 2 weeks, which causes a lot of damage to the patient and hospitalization for about 20 days. The combination of electronic duodenum and TV laparoscopy is the best surgical option to take advantage of the complementary advantages of the two mirrors. On the first day, the stones in the common bile duct were removed with an e-duodenoscope under oral anesthesia in the radiology department with the patient awake, and on the second day, a televised laparoscopic cholecystectomy was performed in the operating room under general anesthesia. On the fourth day, the patient was discharged from the hospital. The combined treatment of cholelithiasis with two scopes is the development trend of biliary surgery and can replace open surgery for the treatment of cholelithiasis. 5.As a palliative treatment method. For tumors around the jugular abdomen, when radical surgery is lost, endoscopic biliary endovascular drainage can not only achieve the effect of draining bile, reducing jaundice and restoring bile and intestinal circulation, but also the method is simple and can reduce the pain and danger of patients. This method is characterized by turning the more damaging direct surgical operation into a less damaging long-distance instrumentation operation, and because of its superior and incomparable performance, the electronic endoscope makes it clearer and more targeted than the naked eye observation of direct surgery in terms of local anatomical landmarks. Thus, unnecessary injuries can be completely avoided.