Abstract: Reliability model of suspension control system of medium and low speed maglev train is established and reliability factors such as the failure rate, MTBF (Mean Time Between Failure), and failure mode of the system are analyzed, to map out the weak points of its reliability. For the weak points, corresponding optimization is carried out to further improve the reliability of the system, and the effect of each optimization on actual operation such as rescue failure, late failure and common failure is evaluated and analyzed.