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This paper research on commercial satellite computers based on COTS (Commercial Off-The-Shelf) devices at home and abroad. Focusing on the requirements of commercial satellite companies on satellite reliability, computational performance, cost control, and research and development cycle, and the actual space operation environment, the current domestic and foreign commercial satellite design patterns and characteristics are analyzed, and a commercial satellite single board computer system based on COTS devices is proposed. In the reliability design, EDAC, dual-core Lock-Step and other technologies are adopted. The MRAM and anti-fuse FPGA of the single-particle immunity device are used to ensure the security, reliability, cost control, and computing performance of the computer system. It avoids the extra software development cost caused by the multi-core or multi-processor redundancy reinforcement scheme and shortens the product development cycle. Research has certain reference value to the reliability design of commercial satellite computer based on COTS device.