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As the new application of combined navigation service,the reliable and efficient security mechanism is urgent to implement multiple navigation service authentication,authorization,and encryption.The method which transmits the un-encrypted message and pe-authority in the terminal,maybe easy to be exhaustive attack.Try to ensure the services by cipher text and multi security mechanism will take up lots of service bandwidth,which is suppose up to 800Mbps per whole authentication.Therefore,how to establish the proper mechanism is the focus of the worldwide researchers on the combined navigation services.First,this paper is supposed to analyze the security demands of the navigation service,which totally ensure the navigation assistant message,the services key and the user key.Second,the whole security mechanism is proposed to suit the combined navigation.The three level encryption mechanism is the root.Third,the group user authority based on single-direction encrypt tree and wheel protocol is demonstrated,which design the tree with random key root node and chain-hash generated polynomial.At the same time,the time-vary wheel token is designed to control the access of user group.According to the simulation,the new mechanism improve the performance of bandwidth efficiency about 40%,which make the services satisfied with the demands of massive users concurrent.