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The existing P2P access control strategy literatures are researched mainly reputation value with trust mechanism, and are discussed less to involve the problem of the information confidentiality and integrity. In this regard, the classifications, and the integrality grade, the interest value, and the reputation grade, of the subject and of the object are introduced. A new access control P2P strategy based on interest classify, trust and security grade is defined in this paper, according to users interested in the extent of the resource, and with the ideas of existing access control strategy. Through their reasonableness analysis and research, the strategy is improved and expanded about existing access control strategy, that can be apply to the P2P network, and it is security access control strategy.