In order to prepare high proton conducting oxide with high chemical stability against CO2 at 600–800 °C, preparation of BaCe0.9−xZrxY0.1O3−δ was examined. Almost single-phase could be prepared for the specimens with x = 0.0–0.2 by Pechini method. Reaction kinetics between BaCe0.9−xZrxY0.1O3−δ and CO2 could be explained by Jander model. With increasing Zr content up to 0.2, apparent rate constant determined from Jander plot decreased by about one order, showing improvement of kinetic stability against CO2. It was also clarified that influence of partial Zr substitution on electrical property was slight, leading to the conclusion that BaCe0.7Zr0.2Y0.1O3−δ exhibited both high kinetic stability against CO2 and relatively high proton conduction.