Abstract: This paper provides a design and implementation of universal software test platform for on-board computer which aims to realize testing generalization. By taking real CPU as the core and utilizing FPGA to simulate peripherals, this platform makes a target system for the software. The test platform is universal for different aerospace craft projects with modular design and parameter configuration. The design of ground simulation software and the logic of FPGA can apply testing incentives and capture results accurately. With proposing in a variety of testing tasks, the results show that the platform is effective, and it has the advantages of short development period and low cost.