介绍了μC/OS-II 实时操作系统的多任务运行和任务间的通信特点，提出了基于μC/OS-II 和ARM 的数控系统总体设计思路，最后阐述了所设计软件中几个关键任务的功能和在实时系统中的实现方法。关键词：μC/OS-II；数控系统；ARM；任务Abstract：The characteristics of μC/OS-II real time operation system which means multi-tasksrunning and communication between tasks, is introduced; the total design ideas of architecture for numerical control system based on μC/OS-II and ARM is presented. Finally, the functions of several key tasks and implementation method in the real-time system in the software designed is detailed.Keyword：μC/OS-II；numerical control system；ARM；task