The clinical term “Ercp biliary stenting” refers to endoscopic biliary stenting and drainage, a procedure that can effectively relieve patients with malignant biliary obstruction with minimal trauma and complications. The procedure starts with ERCP (retrograde cholangiopancreatography), inserting a duodenoscope into the descending portion of the duodenum to find the duodenal papilla, inserting a contrast catheter into the opening of the papilla through the biopsy tube, and injecting a contrast medium followed by an x-ray to find out the location of the obstruction and the length of the stricture. The stenosis was then dilated with a biliary probe dilatation tube under guidewire guidance, and a suitable internal drainage stent was selected and placed distally in the outer bowel of the duodenal papilla. To ensure that the internal stent is patent, it must be replaced in about three months. ERCP biliary stenting is a commonly used method for the clinical diagnosis and treatment of biliary obstruction. If you have the need for biliary stenting, you should go to a regular hospital in time and be evaluated by a specialist for indications and contraindications.