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In the process of establishing routing in VANET, because of the interference of routing request (RREQ) and routing response (RREP), the nodes in the network are busy with looking for routing or establishing routing. The impact on the network performance is extremely serious, such as increasing a lot of network overhead, consuming valuable bandwidth resources. In this paper, the influence of routing replay attack in VANET is studied. Four typical characteristic are extracted by “cross layer” selecting feature vector. The feasibility of VANET routing replay attack IDS based on SVM is verified through simulation experiment.