通信的目的是要把信息及时可靠地传送给对方，因此要求一个通信系统传输消息必须可靠与快速，在数字通信系统中可靠与快速往往是一对矛盾。为了解决可靠性，通信系统都采用了差错控制。本文详细介绍了循环冗余校验CRC（Cyclic Redundancy Check）的差错控制原理及其算法实现。-the purpose of communication is to timely and reliable information to be transmitted to the other side, thus requiring a communication system to be reliable information transmission and rapid, in a digital communication system reliable and fast is too often one of contradictions. This paper describes a Cyclic Redundancy Check (Cyclic Redundancy Check) Principles and error control algorithm.