In the diagnosis of bile duct carcinoma, oral or intraveous cholangiography is of no air in the majority of patients with bile duct carcinoma who are jaundiced. Recently ultrasonography and computed tomography are widely used for evaluation of biliary disease, but dircet visualizing methods of the biliary tract by ERCP and PTC gives more detailed information and exact localization of the lesion. ERCP is less invasive and dangerous and has some more advantages than PTC. We analyzed 33 cases of confirmed extrahepatic bile duct carcinoma who were performed ERCP. The results were as follews: 1. The 7th decade was the predilection age, and the radio of male to female was 3.1:1. 2. The locations of extrahepatic bile duct carcinomas were common bile duct in 45.5%. common hepatic duct in 27.3%, junction of cystic duct and widely extended in 12.1% respectively and junction of hepatic duct in 3.0% in order of frequency. 3. ERCP finding of extrahepatic bile duct carcinomas revealed complete obstruction of bile duct in most cases, and irregular margined protuberant type was more common than smooth margined constricted type at obstruction site. 4. ERCP finding according to the location of lesion showed that protuberant type was relatively frequent in common bile duct and constricted type in common hepatic duct respectively.