Abstract: Objective: To explore the MSCT class features of giant cystic intrahepatic bile duct cystadenomatous tumor, and to evaluate the diagnostic value. Methods: Retrospective analysis MSCT performance of 4 cases of cystadenoma and 2 cases of cystadenocarcinoma of biliary which had been proved by operation pathology, including the location of the lesion, cyst fluid density uniformity, without separation or not, mural nodules and enhancement features, adjacent liver within cystic lesions, dilatation of intrahepatic bile duct and the perfusion of adjacent liver parenchyma. Results: All of 6 cases were cystic, 5 cases near the hilar, 1 case of in under the posterior lobe of liver; 4 cases' hydatid fluid were uniformity, but two cases were not; 5 cases were discretely intracapsular, 1 case not; 2 cases had mural nodules and enhanced significantly, 2 cases separate and wall calcification; 2 cases with of liver small cystic(1-2) near lesions; 5 cases' intrahepatic bile duct were dilated far side of the hilar, 1 case not; 5 cases' surrounding liver parenchyma were abnormal perfusion in the arterial lesions. Conclusion: The MSCT performancegiant of cystic intrahepatic bile duct cystadenomatous tumor with a characteristic have a greater value of the diagnosis, differential diagnosis and clinical treatment.