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With the development of commercial aerospace, in order to apply space computing units at lower cost, it is necessary to evaluate the reliability of redundant architectures of different computing units in combination with design cost, life expectancy, real-time performance and system complexity. At present, the research on Aerospace computing units based on high-performance commercial off the shelf (COTS) devices is mostly satisfied with engineering applications, and there is no comparison on reliability of different architectures. First of all, it introduces the specific topology structure and working mode of several redundant computing units. Second, it gives their fault state transition diagram according to the working mode. Third, according to the above-mentioned architectures, it uses Markov model theory to model the reliability of these computing unit structures, considering the failure rate and maintenance rate Under the influence of parameters on the system reliability, the reliability indexes of each structure are evaluated against the background of a virtual long-term task. The simulation results provide the design support for the lower cost Aerospace computing unit based on cost devices.