Abstract: A composite metal oxide system has been proposed to regulate the thermochemical temperature by doping.The results showed the reduction temperature of cobalt-copper-lithium ternary composite oxide decreased from 850℃ to 795℃.The oxidation temperature was also reduced by 35-50℃.XRD and reaction kinetic analysis showed that the composite phase CoLiO₂ reduced the average activation energy of the reduction reaction from 911 kJ/mol to 602 kJ/mol,which was the main reason for the decrease of the reaction temperature.After 105 cycles,the redox reaction ratio of the cobalt-copper-lithium ternary composite oxide remained above 80%.