Abstract: Chitosan-graft-maleic anhydride(Ch-g-MA)was synthesized with cerium ammonium nitrate as initiator using microwave irradiation.Effects of microwave power,microwave irradiation time and reaction temperature on the percentage and efficiency of grafting were investigated by orthogonal experimental design.The optimal conditions were as follows:the microwave power was 600w,the reaction temperature and time were 90℃ and 30min when the mole ratio of maleic anhydride and chitosan was 2:1 and the fixed concentration of initiator was1.5mmol/L.The polymer was verified by IR spectrum,and the adsoption capability also was studied taking chitosan as a reference.Ch-g-MA in comparison to chitosan was found to have much more adsorption ability for Cd2+ ion in aqueous solution and the removal rate of turbidity for sewage.