Abstract: In view of access control issues in the P2P environment, the trust mechanisms, information confidentiality and integrality, and the user interest are studied in this paper. 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 classification, trust and security grade is defined in this paper, according to users' interest 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 applied to the P2P network ,and it is a security access control strategy.