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P2P technology has been used widely in file and live media streaming sharing fields. But the architecture of P2P technology which we used is imperfect. In P2P system, most users are free-rider. They were not sharing their own resource because the architecture has no perfect incentive mechanism. Therefore, in this research, we propose a novel incentive mechanism (NIM) that considers useful information in social network and various important factors of the peers in P2P architecture to affect the system performance. In addition, we analyze the effectiveness of NIM by game theory. The simulation results show that deploying NIM to P2P system not only promotes the peers to spontaneous sharing their own resource but also decrease amount of free-rider.