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Peer-to-peer (P2P) network systems have an open and dynamic nature for sharing files and real-time data transmission. While P2P systems have already many existing and envisioned applications, the security issue of P2P systems is still worth deeply researching. Some traditional approaches mainly rely on cryptography to ensure data authentication and integrity. These approaches, however, only addressed part of the security issues in P2P systems. In this paper, we propose a trust management model for P2P file-sharing systems. We use the incomplete experience to get the trust rating in P2P systems, and use aggregation mechanism to indirectly combine and obtain other node's trust rating. Simulation results and analysis show that our proposed trust management model can quickly detect the misbehavior peers and limit the impacts of them in a P2P file-sharing system.