A series of CeXZr1-XO2(x=0.5,0.6 and 0.8)mixed oxides were prepared by citric acid sol-gel method with nitrate solution. It was shown that solid solution had formed after calcination at 600℃ by X-ray diffraction(XRD). The surface and crystal structure of solid solutions were investigated by BET, oxygen storage capacity(OSC) and XRD after calcination at 600℃ and 900℃. With increase of mol%Ce, the specific surface area(SSA) and OSC of samples decreased ,while the stablity reduced by the analysis of XRD. It was shown that the temperature of peak had decreased after calcination at 900℃ by H2-TPR because of complete decomposition of citric complex at high temperature.