本文从理论上推导出CRC算法实现原理，给出三种分别适应不同计算机或微控制器硬件环境的C语言程序。读者更能根据本算法原理，用不同的语言编写出独特风格更加实用的CRC计算程序。-This paper theoretically CRC algorithm realize the principle of adaptation, respectively, given in three different computer or microcontroller hardware environment of the C language program. Readers more in accordance with this algorithm, using different language to prepare a more practical style of CRC calculation program.