Objective Analysis of Rasmussen encephalitis MRI imaging, to evaluate MRI in the diagnosis and prognosis evaluation of Rasmussen encephalitis application value. Methods Collection for Rasmussen encephalitis patients confirmed by clinical pathology in 7 cases, on the transverse, sagittal and vertical long axis of the cornu ammonis oblique coronary arteries and veins of scanning, T1WI, T2WI and FLAIR series of image, analyzing the characteristics of the MRI image, and contrast with the clinical pathologic results, to explore the value of MRI in Rasmussen encephalitis diagnosis and prognosis assessment. Results 7 patients in this study, MRI image showed 5 cases of lateral ventricles body expanded, temporal Angle of 6 patients, 6 patients with the lateral fissure broadening, 6 cases with local widened the sulci and gyri smaller, 5 cases of putamen and caudate nucleus atrophy; 7 cases of patients with gray and white matter T2WI and FLAIR series has high signal, T1WI series is uneven low signal; With the progress of the lesion, MRI image visible lesions hemisphere atrophic changes increase and expanded, cortex signal change is larger. Conclusion Rasmussen encephalitis patients MRI images have a certain characteristic, can more accurately detect the progress of disease, in the evaluation of the diagnosis and prognosis of the disease has a high application value.