针对操作系统中的作业调度算法在教学过程中存在的模糊性、难理解性等问题，引入时间轴法，以“先来先服 务算法”和“计算时间短的作业优先算法”为例，对“时间轴法”在作业调度教学中的应用作了介绍，以时间演进顺序分析了何时 存在资源竞争、需要采用调度算法进行资源分配，在教学实践中取得了显著的效果。

It’s a challenge to vividly introduce the job scheduling algorithms. To solve it, a method based on time-axis is introduced in the paper to describe them. Firstly, the allocation performance of system resources is shown clearly in the time axis. Secondly, the implementation procedure of“first come first served”scheduling algorithm and“shortest job first”scheduling algorithm are described visually in the time-axis. The results of teaching practice shows that this time-axis method is a useful way to teach the job scheduling algorithm in operating system.