For the deep removal of CO from hydrogen?rich gas,the preparation of catalysts with better CO?Prox catalytic performance is a current research hotspot.CuO/NiO?CeO₂ catalysts were prepared by stepwise impregnation method,and the catalysts were characterized by XRD,BET,H₂?TPR and HR?TEM to investigate the effects of molar loading of metal Cu+Ni (metal loading) on the catalysts' structure,reduction properties and their CO?Prox performance.The results showed that Cu/Ni?O?Ce solid solutions were all formed in CuO/NiO?CeO₂ catalysts.The catalytic activity is mainly related to the content of Cu species highly dispersed on the carrier surface as well as to the content of the solid solution.Among them,the catalyst with a metal loading of 8% had a higher content of Cu species highly dispersed on the carrier surface and a higher content of solid solutions,and the catalyst exhibited better catalytic activity.Under the CO/H₂/CO₂/O₂/Ar atmosphere,a reaction temperature of 130 °C,an oxygen excess coefficient of 1.2,and a mass?air velocity of 20 266 mL/（g·h）,the CO conversion was 95.9%,and the CO oxidation selectivity was 86.3%.