通过模拟实现请求页式存储管理的几种基本页面置换算法，了解虚拟存储技术的特点，掌握虚拟存储请求页式存储管理中几种基本页面置换算法的基本思想和实现过程，并比较它们的效率；操作系统的发展使得系统完成了大部分的内存管理工作，对于程序员而言，这些内存管理的过程是完全透明的。因此程序员从不关心系统如何为自己分配内存，而且永远认为系统可以分配给程序所需要的内存。在开发程序时，程序员真正需要做的就是：申请内存、使用内存、释放内存。该实验就是帮助读者更好地理解从程序员的角度应如何使用内存。-Through simulation request several basic page memory management page replacement algorithm, to understand the characteristics of virtual storage technology, with virtual storage request page memory management page replacement algorithm in several basic basic idea and implementation process, and to compare their efficiency　 development of the operating system so that the system' s memory management to complete the majority of work for programmers, these memory management process is completely transparent. So never cared how the system programmer to allocate memory for themselves, and always think the system memory can be allocated to the program needs. When developing the program, the programmer really need to do is: Application memory, using memory, free memory. The experiment is to help readers better understand from a programmer' s point of view on how to use the memory.