The simulation algorithm of probability of spares sufficiency for repairable item with degenerate performance is offered through simulating the process of use and maintain of components.

• 采用事件调度法的策略对装备使用与维修过程进行仿真,给出了修复后性能下降的可修件在先换新件和先换旧件两种策略下备件可用概率的仿真算法。