提出了一种实时系统任务模型 ,分析了该模型中周期和非周期任务可调度的条件 ,并给出了一种强实时非周期任务的可预测调度算法。该算法按照 RMS算法的原则统一调度系统任务 ,保证系统周期和非周期任务满足各自的时限约束 ,实现了强实时非周期任务的可预测调度 A real-time system task model is proposed. The conditions of periodic and aperiodic task scheduling in this model are analyzed. A predictive scheduling algorithm for strong real-time aperiodic tasks is given. According to the principle of RMS algorithm, the algorithm uniformly dispatches system tasks to ensure that system and non-periodic tasks meet their respective time-bound constraints and achieves predictable scheduling of strong real-time non-periodic tasks