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P2P based topology (VoD) has become one of main technologies for video on demand(VoD). Up to date, large-scale VoD system encounters low concurrent resource sharing and VCR requirements. In this paper, we propose a trust model to incentive VoD users contribute their storing materials. And we focus on the discussions of trust component for computing and content redundant coverage in large scale VoD in this paper. At last, several measurements of trust and content coverage of pre-fetch scheme are exploited by simulations.