Objective To investigate the clinical value of CT + MRI in the diagnosis of arterio venous alformation. Methods Retrospectively analyze clinical and CT + MRI data of 32 patients with arterio venous malformation in our hospital from March 2014 to March 2016. Results Through the diagnose of CT and MRI, among 36 patients, there are 37 cases of tumors, 35 cases are single. The maximum diameter of tumor ranges 1.4 -6.7cm, the average is (4.12±0.3)cm. There are 16 round tumors. Among 36 patients, there are 4 cases involved in before cranial fossas, 7 cases involved in the middle cranial fossa, 1 case involved in posterior cranial fossa. In addition, there are 2 cases of bleeding condition, 17 cases of necrosis and calcification characteristics. Conclusion CT+MRI can effectively diagnose the Morphological characteristics of sphenoid ridge meningioma tumor and involvement of surrounding vital structures. There is high diagnosis accuracy of comprehensive and detailed preoperative assessment of the various imaging features, and it is of great importance in handling issues related to the case in the development of operation, post-surgery program and preliminary prognosis.