Abstract: The system structure and safety design principle of the general trackside computer safety platform are introduced, which has passed the third-party SIL4 level safety certification. The platform adopts double two out of two safety architecture, and uses modular, universal and scalable hardware, as well as cross platform and unified software for the design. As a result, the safety platform is successfully applied to many projects, such as CBTC (communication based train control), TACS (train autonomous circumambulate system), tram signal system and so on. The practice has proved that the safety platform fully meets the technical requirements of four key elements of rail transit products: safety, reliability, maintainability and applicability.