Two kinds of adsorbents, Cu/AC-HN and Ag/AC-HN, were prepared by using an incipient wetness impregnation method using copper nitrate and silver nitrate as the raw materials and activated carbon treated by nitric acid（AC-HN）as the support. The effects of impregnants, calcination temperature, calcination time and amount of loaded on the adsorption capacity of low concentration of carbonyl sulfide(COS) at ambient temperature were investigated. The adsorbents were characterized by employing N2-physical adsorption, FE-SEM, TG-DTG, XRD and FTIR. Dynamic adsorption experiments results showed that the adsorption capacities of the adsorbents were significantly improved after modified. Silver ions were reduced to Ag0 in the surface of AC. The adsorbent Cu/AC-HN showed a better adsorption capacity and the active sites were existed in the form of Cu2O. The specific surface areas of the adsorbents were getting down and the functional groups of AC had no change after modified by Cu(NO3)2. The active sites phase of Cu/AC-HN showed high dependent on the calcination temperature in the preparation process. Copper nitrates were decomposed into CuO, then reduced to Cu2O by AC with the calcination temperature increased and the amount of Cu2O achieved maximun at 350℃. Above 350℃, Cu2O were reduced to Cu0 and the active sites were lowered. The adsorption capacity of AC was 7.5mg/g for removal carbonyl sulfide(COS), while the adsorption capacity of Cu/AC-HN reached 14.8mg/g. The optimal preparation conditions were as follows: the calcination temperature and time were 350℃ and 1.5h respectively, and the copper loading amount was 5%.