According to the present invention it is possible to provide a kind of aqueous hydrogen peroxide solution, can be used for reducing number of bacteria and be characterized in that containing hydrogen peroxide, phosphate ester salt and aluminium salt as necessary component. According to the present invention, a kind of sterilization method is also provided, which is characterized in that by air and water mist aqueous hydrogen peroxide solution and/or gaseous hydrogen peroxide solution, sterilize gained mixture will with material.