It includes the blue tooth safe software and correspondence system; According to the SIG of 1.1 the blue tooth agreement norm of versions, it increases the safety of the blue tooth equipments and achieves the blue tooth correspondence between the PDA and PC. It can not only identify equipments, but also the users, which prevents from illegally using and forging equiptments. It offers dependable encryption. The system can examine the interference and the change of signal transmission. It provides the safe wireless correspondence for the complete private LAN.