先来先服务（FCFS）、短者优先（SJF）、高优先权优先（FPF）是操作系统作业调度的三种基本调度算法。本文用程序模拟这三种调度算法的过程。通过对各个进程在调度过程中参数（开始时间、完成时间、平均周转时间和平均带权时间等）的变化的记录，加深对三种调度过程的认识。-First-come, first-served (FCFS), short-preferred (SJF), a high priority priority (FPF) is the operating system, job scheduling of the three basic scheduling algorithms. In this paper program to simulate the process of the three scheduling algorithms. Through the course of the various process scheduling parameters (start time, completion time, the average turnaround time and average weighted time) record of changes to enhance the understanding of the three kinds of scheduling process.