Abstract: In order to develop a filter additive to selectively remove hydrogen cyanide from cigarette smoke,the ordered mesoporous silica material MCM-4l prepared by hydrothermal synthesis method was dual functionally modified by alkaline groups and transition metal ions.The pore structure,pore size distribution,pore volume,specific surface area and element composition of the functionalized material were characterized.The influences of preparation conditions on the adsorption ability of functionalized material to HCN were investigated,and its effects as a filter additive were evaluated.The results indicated that:1) The material obtained by modifying MCM-41 with N-(β-aminoethyl)-(γ-aminopropyl) methyldimethoxysilane(EPDMS) and transition metal ion remained its two-dimension-hexagonal pore structure and high specific surface area and pore volume.2) The Zn²⁺/c-EPDMS/MCM-41 prepared from 4 mL EPDMS per gram of MCM-41 and transition metal ion of Zn²⁺had the best adsorption to HCN in cigarette smoke.3) When Zn²⁺/c-EPDMS/MCM-41 prepared under the above conditions was added to a dual-filter of cigarette at a rate of 20 mg/cig,the HCN in mainstream cigarette smoke was selectively reduced by 31.2%,and the hazard index(H) of cigarette decreased by 0.4.The dual functionalized material Zn²⁺/c-EPDMS/MCM-41 possesses good selective adsorption ability to HCN in cigarette smoke.