Based on the characteristics of BCH code and comparing with the non-binary BCH code to the binary BCH code,the critical code of BM algorithm is presented with emphasis on the fundamentals of BM algorithm.

• 结合BCH码的特点,重点研究了BCH码中BM迭代译码算法的基本原理,对二进制BCH码与非二进制BCH码作了简单的比较,给出了算法的关键代码。