Abstract: The effects of Pt/YSZ electrode sintering temperature on its characteristics were studied by AC impedance,cyclic voltammetry,chronoamperometry,and SEM observation.The result indicates that as the sintering temperature increases,the activation energy of the electrode process decreases,both the electrode total resistance and response time decrease first and then increase.While the sintering temperature is below or equal 1 100 ℃,a large quantity of oxygen atoms are adsorbed on the Pt electrode surface,Pt oxide will be found due to the site exchange reactions of the adsorbed oxygen atoms and Pt atoms,and the activation energy of the electrode process is from 177 to 230 kJ·mol^-1;as the sintering temperature is above 1 100 ℃,Pt oxide probably existed in the electrode system decomposes completely,and the activation energy of the electrode process is from 107 to 172 kJ·mol^-1.The electrode sintered at temperatures of 1 000 to 1 100 ℃ has the least total resistance,the shortest response time of charge transfer,and the highest activity.