Abstract: Reliability, Maintainability and Supportability(RMS) are important design features that significantly affect the availability of the warship.In order to enrich the design and analyzing methods of war-ship's RMS, this paper, based on the task process, proposes a modeling method for warship's RMS simulation by using the computer simulation modeling technology, establishes a dynamic description model reflecting the relationship among the warship's tasks, equipment, and support resources, and designs a simulation process of the warship's RMS by exploiting the simulation method for the discrete event system.Finally, the modeling and simulation software system is implemented, which includes the overall frame, function module, and main user interface.It is concluded that the proposed system could provide technical and analytical support for the design of warship's RMS.