Abstract The applications of palladium membrane in the reaction system for producing olefin and hydrogen were introduced.By using palladium membrane,the reaction temperature was reduced in methane,methanol reforming reactions,and both of the conversion of the reactant and the selectivity of the product were increased for the dehydrogenation of propane,��i����butane,ethylbenzene.The satisfying results were also obtained in the reactions for catalytic decomposition of ammonia,water-gas shift and nitrate removal from water.����