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讨论了待命储备系统具有容错性能时的任务可靠性计算，由于故障检测器、切换器和待命器件是否可靠，直接影响该容错系统的可靠性．为了正确评估系统的任务可靠性，这里考虑了检测器和切换器存在一定的误警率和误切换率．据我们所知，Ｍａｒｋｏｖ模型是处理这个问题的主要工具，而国内很少有这方面的讨论．本文用Ｍａｒｋｏｖ理论来确定系统的状态及其状态转移矩阵，从而容错可靠性的计算问题得到解决，此外还讨论了有关误差概率的计算模型．
The task reliability calculation when the standby system is fault-tolerant is discussed. The reliability of the fault-tolerant system is directly affected by the reliability of the fault detector, the switch and the standby device. In order to correctly evaluate the mission reliability of the system, it is considered here that the detector and the switch have certain false alarm rate and false switching rate. To the best of our knowledge, the Markov model is the main tool to deal with this problem, while there is very little discussion in this area. In this paper, Markov theory is used to determine the state of the system and its state transition matrix, so that the calculation of fault-tolerant reliability is solved. In addition, the calculation model of error probability is discussed.