Taking Cu(CH3COO)2·H2O and activated carbon (AC) which was treated by acid and alkali as raw materials. The polylol reduction method was then adopted to prepare the cuprous oxide and activated carbon composite material. The structure and morphology of composite material samples were characterized by BET, SEM and XRD. The effects of cuprous oxide and activated carbon composite material on reducing the hazards of hydrocyanic acid in the cigarette were studied. Different pretreatment methods and the effect of mixture ratio to drop focal relieving harm of hydrocyanic acid in the cigarette were examined.