As the most abundant metal on the earth, aluminum is one of alternative clean fuels. This work presents experimental studies on the reaction process characteristics in a specially designed reactor using Al-based metals as fuel. The experiments of different samples with steam in a thermogravimetric analyzer and special designed reactor indicated that Al-Li alloy had a better reactivity than Al-Mg-Li. The efficiency was 87.83% and H-2 yield reached 1155.03 ml/g for Al-Li alloy. It is feasible to use Al-Li alloy as fuel to provide H-2 and heat.