The addition of lithium to Al-H2O reaction is proven an effective means to produce hydrogen. This study conducted experiments on a specially designed test system. Results of the experiment indicated that Al-Li alloy had a high reactive activity in water vapor. The reaction of Al-Li alloy with water vapor at the range of 300 degrees C to 700 degrees C can produce H-2 of 980-1120.8 ml/g. A thermal infrared imager in the specially designed reactor recorded the surface temperature change in the reaction process. Temperature analysis can guide the utilization of the heat released in Al-H2O reaction.