Patient Zheng, gender male, age 84 years old, was diagnosed as cholangiocarcinoma type I. Endoscopic radiofrequency ablation with bile duct metal stent placement was proposed. The esophagus and stomach were not special, the duodenal papilla was papillary with granular opening, the incision knife was inserted under the guidance of guidewire, and 15ml of 30% iodophorol was injected, the bile duct was visualized, and an irregularity of the lower part of the common hepatic duct of about 2CM in length was seen under the fluoroscopic view, the length of the proximal common hepatic duct of the narrowed section was about 2CM, and the intra- and extra-hepatic bile ducts were obviously dilated above the narrowing, and the HABIB ENDOHPB biliary radiofrequency ablation catheter was used at the narrowed section to Radiofrequency treatment was performed with a power of 10W and a time of 120 seconds, and the lumen of the stenosis was thickened and a small amount of necrotic tissue flowed out of the papilla. A metal stent with a diameter of 1.0 cm, a length of 6 cm, and a length of 5 cm was placed in the stenosis, with the proximal end located 1 cm above the stenosis. the stent was well positioned, and bile drainage was smooth. The gallbladder and pancreatic duct were not visualized.