By impregnating chemical reagent to activated carbon, the treated gas will be purified by physical and chemical adsorption at the same time, thus it may improve treatment effect and saving treatment costs. We may also use many kinds of impregnated activated carbon together according to the constitutive property and concentration ratio of purified gased. Impregnated activated carbon is a kind of high efficiency, environmental and new-type catalytic activated carbon adsorption material.