Extrahepatic cholangiocarcinoma is a rare, aggressive malignancy of the digestive system with high recurrence rate and poor prognosis. With the development of modern medicine and radiotherapy technology, combined with surgery, chemotherapy, and biliary stent,etc., radiotherapy plays a more and more important role in the treatment of resectable and unresectable patients. At present, a large number of studies have shown that external beam radiotherapy, intraluminal brachytherapy, stereotactic body radiation therapy and other kinds of radiotherapy techniques have good safety and efficacy, but its clinical application is still controversial.