The invention provides a PMS (phased-mission
system) reliability layering modeling method based on a
failure mechanism comprehensive damage accumulation rule. The method comprises the following steps:S1, clarifying all the missions needing to be executed and the specific phases of each mission, analyzing component parts of the
system under each mission and phase, and clarifying a damage accumulation mode between the key
failure mechanism of each part in each mission and phase and the
failure mechanism; S2, establishing a BDD model of a
system failure mechanism layer according to the main failure mechanism of each working part as well as the type of each failure mechanism and the
system structure; S3, establishing a BDD model of a system phase layer by utilizing the BDD model of the systemfailure mechanism layer obtained in the step S2; S4, further establishing a BDD model of a system mission layer for the phased-mission system; and S5, evaluating a reliability function when the phased-mission system executes the mission series. The models of all levels are combined and an integrated method is provided for reliability modeling of the phased-mission system.