Abstract: To deal with maintenance resources waste and potential human error hazards caused by fixed-interval preventive maintenance of switch machine components, a preventive maintenance strategy for switch machine components based on the GO-FLOW model is proposed. According to the composition, structure and working flow of the switch machine, a GO-FLOW model of the switch machine is constructed. Under the constraints of overall reliability of the switch machine, the degree of reliability of major components of the switch machine in different servicing periods can be quantitatively derived by use of failure statistics. Based on that, the preventive maintenance plan for switch machine components at variant maintenance intervals can be formulated so as to make more targeted maintenance, better balancing the economy and safety of maintenance.