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Rang test equipment quality and integrated supper effect estimate is important mission for equipment use phase, the availability is one of the parameters that best reflects the operational state. It is a synthesis of testability, reliability, maintainability, supportability, security and environmental adaptability. In this paper an overall thinking of Rang test equipment service architectures for availability based on cloud calculating and knowledge management method is presented. And service architectures for availability is described based on cloud calculating analysis technology for equipment status monitoring, simulation-driven availability prediction, preventive maintenance supporting operational decision-making. The main goal in this paper is realization equipment availability predictive analytics services, enable Rang test equipment availability bring about maximize likelihood.