Abstract: Objective:To explore the role of magnetic resonance cholangiopancreatography(MRCP) in diagnosis of biliary obstructive diseases and the imaging manifestations of benign and malignant lesions.Methods:The MRCP and clinical data of 45 patients with biliary obstructive diseases were analyzed retrospectively.Results:The diagnostic accuracy rate of MRCP was 100.0% for location and 88.9% for qualitation.The imaging manifestation of biliary stones was filling defects in the bile duct which was surrounded by bile or obstruction in the shape of a cup,cholangitis displayed a segmental dilation and stenosis of the bile duct,malignant lesions showed an abrupt occlusion or asymmetric narrowing in the bile duct.Conclusions:MRCP is of great value in diagnosis of biliary obstructive diseases and should be used as a routine examination means.