循环冗余校验CRC（Cyclic Redundancy Check）是由分组线性码的分支而来，其主要应用是二元码组。编码简单且误判概率很低，在通信系统中得到了广泛的应用。重点介绍了CRC校验的原理及其算法实现。-Cyclic Redundancy Check (Cyclic Redundancy Check) is a linear code from the branch, its main application is binary codes. Coding simple misjudgment of very low probability, the communications system, which is widely used. Highlights of the CRC algorithm and its principles.