The Ce-Zr-La-O solid solution was prepared by the sol-gel method. The structure and the redox behavior of Ce-Zr-La-O solid solution and CuO/Ce-Zr-La-O catalysts were investigated by using XRD, Raman and TPR techniques. The result shows that the reduction capability of Ce0.7Zr0.3-yLayO solid solution is related to content of La. Appropriate content of La can enhance the redox capability of the solid solution. The oxidation activity of the CuO(6%)/Ce0.7Zr0.15La0.15O catalyst is the highest. CuO, which finely dispersed and interacted with the support, is the site of oxidation activity.