Bile duct stenting is minimally invasive and very minimally traumatic. There are two types of biliary stenting procedures, one is to put the stent in through the natural lumen under gastroenterology endoscopy; the other is percutaneous perforation, through the liver, through the bile ducts, and then the stent is put in. There are bile duct stenosis, bile duct stenosis has benign stenosis, there are malignant stenosis, what situation with endoscopic placement, what situation with percutaneous transhepatic puncture to put the biliary stent, it depends on the location of the stenosis, obstruction, if the location is too high, endoscopy generally can not reach the location can not be put, if the location is relatively low, the lower end of the common bile duct near the pot-bellied mouth can be done with endoscopic placement of stents, endoscopic stenting trauma The endoscopic placement of the stent is less traumatic, that is, over the duodenal papilla can be placed on the stent, if the position is too high mirror can not be reached, it is necessary to percutaneous percutaneous percutaneous hepatic puncture of the biliary tract from outside the body, and then do cholangiography to put the stent. After stenting, the stenosis position will be determined, the stent will be measured, and there are no side effects after stenting, but there may be some stimulation of the bile duct during the process of stenting, and if the patient is older and in poorer physical condition, he should be put on cardiac monitoring during the operation because some patients are uncomfortable after stimulation of the bile duct, and there is bile-cardiac reflex, so the cardiac monitoring will find the problem in time and deal with it, and there are no other side effects. There are no other side effects.