In this paper, a DHTbased crossprotocol P2P resource sharing model is proposed to address the interconnection and intercommunication problem in the existing P2P systems, where the DHT network stores the resource information for each P2P system. The peer in the model implements each P2P protocol and can participate in multi P2P systems and intelligently find out the same resources among them. Through downloading the resources in parallel from multi P2P systems, the model can provide essential functions to the original system, such as reducing user response latency, minimizing file download time and providing Quality of Services (QoS) guarantees. Simulation results demonstrate that the model has better system robustness, scalability and user experience than the current P2P systems.