Abstract: The traditional on-board safety computer generally adopts large-scale case design, which is not conducive to the flexible configuration and function expansion of on-board equipment. This paper designed a distributed vehicle safety computer system based on FlexRay bus. The system adopted two sets of small case design. The FlexRay bus was used inside a single case to form a two out of two security computer. Two sets of the same two out of two security computers were connected with the switching module through FlexRay bus to form a two by two out of two security computer system. The designed safety computer system can be flexibly configured to meet the miniaturization requirements of different types of vehicles, and can provide a reference for the design of miniaturized safety computer.