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Being a new Internet application, social-based P2P network, which merges P2P file sharing technology and social network, is drawn more and more attention. However, it also brings in new challenges when facing the problems of trust management and personal privacy protection. In this paper, we aim at social-based P2P, and design a set of trust management mechanisms with peer uncertain risk evaluation and personal privacy preserving, which is able to encourage peers cooperation and defend Bad-Mouth attack from malicious peers. Another advantage of our solution is that it is very flexible for users to define fine-grit access control policy.