In view of the clustering of P2P networks and the issues of increased communication latency and network costs caused by mismatch between the logical topology and the physical topology, this paper proposes a mixed three-layer P2P network model. The model adjusts the network structure dynamically based on the position and the property features of nodes, so that the performance of searching resources can be improved adaptively. The simulation result shows that the P2P networks can achieve a high recall ratio with low search delay and cost.