Before bile duct stenting surgery, routine tests should be completed, such as blood routine, patient’s coagulation function, and some routine films and electrocardiogram should be done, except for the problems of heart and lung function, liver and kidney function, and blood routine, and then biliary stenting can be done. Before stenting, ultrasound or CT or MRI should be done to clarify the location, degree and length of biliary stenosis, and after this full preparation, then percutaneous transhepatic bile duct puncture should be done, and cholangiogram should be done first. If the stenosis is particularly severe after the dilatation tube is inserted, a small biliary balloon will be used to dilate it first, and after the dilatation, it will be possible to avoid the stimulation of the biliary tract or the bleeding of the biliary tract or the reaction of the biliary tract mucosa during the process of stent placement. After the biliary stent is placed, the patient should be bedridden for 24 hours, and the diet should be light and not too much food. If the bile is drained out of the body, the bile flow must be observed, and the degree of bilirubin decrease must be rechecked after three days, and the liver and kidney function must be rechecked. Because too much bile loss can easily lead to problems with the patient’s kidney function, so these must be taken seriously. If the biliary stent is okay after three days of review, you can get out of bed and eat ordinary food naturally.