Abstract: The catalysts of supported copper oxide were prepared by impregnation method, which were characterized by XRD, TG-MS, XPS, NO-TPD, NH₃-TPD and H₂-TPR and the effect of carrier on the performance of catalysts for the selective catalytic reduction of NO with NH₃ at low-temperature in the presence of oxygen was investigated.The results show that the copper species exist in the form of CuO and Cu₂O on carriers.The dispersion and oxidation state of copper species, the acidity and redox ability of the catalysts and the performance of adsorption/desorption are affected by the carriers.The Cu/HZSM-5 catalyst with highly dispersed copper speicies has excellent redox properties, suitable acidity and acid capacity, and good adsorption/desorption performance for reactants, which shows a good catalytic activity in the NH₃-SCR denitrification reaction.The reaction temperature is lower, T₅₀ and T₉₀ is 137 and 165℃, respectively, and the active window temperature is wide.The temperature range for the NO conversion of over 90% is 165-358℃.