将实时特性引入分布式系统将会给系统可靠性设计与分析带来许多新的变化．文中首先给出了所研制的信息处理系统的描述，然后给出系统可靠性设计的基本原则，文章最后按系统实时性的强与弱，分别建立了可用度分析模型，并对系统的可用度进行预计． The introduction of real-time features into distributed systems will bring many new changes to system reliability design and analysis. The article first gives the description of the developed information processing system, and then gives the basic principles of system reliability design. Finally, according to the strong and weak of the real-time system, we establish the availability analysis model and analyze the availability of the system Expected.