Aiming at the demand of low latency transmission in tactical data link, one channel coding scheme which called nonsystematic shortened length RS (31, 19) codes is presented in this paper. The encoding and decoding algorithm of nonsystematic RS codes and shortened RS codes are discussed based on MS polynomial. Finally, a developed BM algorithm is used to improve the velocity of decoding and simplify the hardware design of data link, complex encoding and decoding algorithm of RS (31, 19) is implemented in the Altera's FPGA EP3SE110 successfully.