Objective To investigate the CT and MRI features of autoimmune pancreatitis (AIP) and its clinical diagnostic value. Methods The CT and MRI imaging features of 13 cases of AIP confirmed by pathology and clinical treatment were analyzed retrospectively. CT scan and enhanced scan were performed in 13 patients, of whom 10 underwent magnetic resonance imaging(MRI) and thin layer magnetic resonance cholangiopancreatography. Results In the 13 cases of patients under CT examination, 8 patients had diffuse enlargement of the pancreas, 5 patients had localized swelling of the pancreas, and was swollenlike changes. The CT scan was homogeneous, with a slightly lower density, and 9 patients showed marked delayed enhancement. In 8 patients, the pancreas showed blurring and 7 had the appearance of the tunica vaginalis sign. T1WI of MRI examination of 10 cases showed low signal, T2WI showed slightly high signal. Thin MRCP showed 3 cases of common bile duct in rat caudate stenosis, 3 cases were misdiagnosed as common bile duct and pancreatic segment occupying; 5 cases of pancreatic duct showed segmental stenosis or mild dilatation, 3 cases of patients with peripheral vascular boundary is not clear. Conclusion The imaging features of autoimmune pancreatitis have some characteristics, and correct diagnosis can be made for most patients according to the imaging findings.