P2P technology is the focus direction of current research, with many research institutions and enterprises joining in, who have made remarkable achievements. Due to Constrained by its own characteristics of mobile network, the good technology of some other network is not suitable for mobile P2P network. This paper presents a method of generate P2P topology based on mobile network. We use this method to generate overlay network topology by improved Chord algorithm, and propose a method of process movement of nodes. Experiments show that the method can obviously reduce the average delay of overlay network, significantly improve the network’s search capabilities.