This paper describes the innovation on hydrogen generator by ammonia decomposition process, electric heating is replaced by steam heating, the vaporizer of ammonia is reconstructed, nitrogen is heated directly by electric heating to make molecular sieve regenerate, purification system is transformed. 改造氨汽化器,用蒸汽加热液氨替换电加热液氨;用电加热器直接加热氮气,使分子筛加热再生,改造净化系统。