Abstract: In this paper, the concept of cluster ID is put forward, and a new method is put forward based on which the routing information and key information are transferred to the next cluster head in the replacement process. When the cluster ID is used, the data packets can be sent directly to the cluster ID in the next hop node, which can avoid the complicated process of the cluster head. According to the existing cluster key and application of Diffie Hellman algorithm generated key between the new cluster head nodes. Finally, we use formalization of BAN logic analysis method, the security of the protocol is proved.