Ce0.6Zr0.3Pr0.1O2 solid solution was prepared by co-precipitation technique and characterized by XRD, FT-Raman spectra, and SEM. Palladium-only three-way catalysts containing Ce0.6Zr0.3Pr0.1O2 as well as CeO2 was also prepared and evaluated under the condition of simulated exhaust in the lab. The results show that Ce0.6Zr0.3Pr0.1O2 has cubic fluorite solid solution structure that is stable at higher temperature. Compared with Pd/CeO2, Pd/Ce0.6Zr0.3Pr0.1O2 possesses wider air/fuel ratio operating window and lower light-off temperature.