Abstract: A novel security address autoconfiguration SMAAC scheme is presented that based on IPv6, after a new node passed the identifying of the authorization server by the way of password and admitted to join the net, the server broadcasters a permitting ticket for the node, the neighbors of the node check the tickets and produce the IPv6 address according to the hardware information of the new node, and finish the duplicate address detection, the whole process ensures the validity of the new nodes. The security and performance of the protocol are analyzed and simulated at the end.