Abstract: The failure tree affecting the reliability of the tilting mechanism control system of tilting trains is introduced. Then the redundant control system is used to serve as the reliability optimization model of the system, and the formula of reliability is derived. At the same time, the redundant system is achieved by means of the automatic change-over switch and the network technology, and their compositions are described. It is pointed out that using the network technology to realize the redundancy is a good choice because it is convenient and can improve the reliability of the system.