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The improvement of equipment complexity leads to more complicated faults reasons, and the requests of the ability, efficiency and feasibility to deal with the faults are improving continuously. So the quondam manual diagnosis and the fault diagnosis method by traditional single expert system cannot adapt to the request of monitoring and diagnosis to modern complex equipment any more. In this paper, a distributed intelligent condition monitoring and fault diagnosis system function model based on multi-Agent with the idea of component is established, and the structure and function of each Agent in this model is described in detail. By cooperation of multi-agent, this model system can adequately utilize distributed knowledge, information and technology resource to improve the adaptability to dynamic environment of monitoring and diagnosis system, and the distributed computation and problem solving can be realized in network environment. This model that has a certain guidance meaning for realization of the distributed intelligent monitoring and diagnosis system, is helpful to build an integrated, intelligent and network diagnosis system. It can give a gist to establish distributed intelligent monitoring and diagnosis system for large-scale complex equipment.