A new method of hydrogen production by mechano-chemical reaction of aluminum(Al) with water was studied. There was a long induction period for hydrogen production by the reaction of Al with water. This induction period was remarkably decreased by the addition of high hardness materials such as SiC, BN and SiO2. It was concluded that, since the aluminum oxide layer on Al surface was effectively destroyed by addition of high hardness materials, induction period of mechano-chemical reaction of Al with water decreased.