Abstract: Because of the characteristics of the dynamic spectrum in cognitive radio, a special security problem of deception attack is proposed. In the distributed cognitive radio networks, cognitive nodes perform routing setup using on-demand routing protocol, malicious nodes can launch attack by adding false spectrum information to route request packet and making other nodes to reject data packet which need to be transmitted. In order to solve this security problem, cognitive radio networks are divided into single-hop clustering structure, and cluster-head is designed to detect malicious nodes. The paper designs a routing protocol by combining with cluster-head detect, which proved to be feasible and reliable for data transmission. Theoretical analysis and experimental simulation show that the security issues can significantly reduce the network performance, and the proposed solution is with security and feasibility.