伪随机数在计算机软件设计中有很广泛的用途。本程序包含有基于数学方法的利用计算机产生伪随机数的一种方法，即线性同余法，任何伪随机数的产生都是运用递推的原理来生成的。以及在Visual C++环境中产生伪随机数的两个重要函数，rand和srand函数，正确地使用这两个函数是产生性能良好的伪随机数的关键，最后介绍了利用伪随机数生成技术在MFC中生成基于C/S模式应用程序的随机校验码以及利用一种软件工具ImagePassword产生随机密码。-Pseudo-random number have a very wide range of uses in computer software design. The Program includes a method for pseudo-random number generation using a computer-based mathematical methods, namely linear congruential method, any pseudo-random numbers are generated using the principle of recursion to generate. And two important functions generate pseudo-random numbers in the Visual C++ environment, rand and srand functions, the proper use of these two functions is the key to good performance of the pseudo-random number generation, and finally describes the use of pseudo-random number generation techniques in MFC It is generated based on C/S mode applications and the use of a random check code ImagePassword a software tool to generate random passwords.