本文通过对１９例脑动静脉畸形（ＡＶＭ）的临床及ＭＲＩ影象分析，总结了ＭＲＩ及ＭＲＡ的表现，指出中场强ＭＲＩ检查中：异常的血管流空现象、脑内及蛛网膜下腔出血、脑组织的水肿、变性及萎缩等均有助于ＡＶＭ的诊断。ＭＲＡ则对判断病灶的供血动脉及引流静脉有帮助，ＭＲＩ及ＭＲＡ的诊断价值及准确性优于ＣＴ。 This article summarizes the performance of MRI and MRA through the clinical and MRI image analysis of 19 cases of cerebral arteriovenous malformations (AVM), points out the mid-field MRI examination: abnormal vascular flow phenomenon, intracerebral and subarachnoid space Bleeding, brain edema, degeneration and atrophy are helpful to the diagnosis of AVM. MRA is helpful in judging the feeding artery and drainage vein of the lesion. The diagnostic value and accuracy of MRI and MRA are better than that of CT.