Abstract: In order to ensure the devices in PAN work to cooperatively provide users with personalized services efficiently, we propose a distributed system architecture which is more suitable for heterogeneous environment.The distributed layered architecture model brings the mechanisms of device joining/leaving the system and a chord based algorithm to perform efficient service discovery, which enables the services provided by different devices to be discovered and invoked rapidly and accurately.A simulation is provided to validate the feasibility of the system.The approach solves the problem of the efficient service provision in PAN.