Perovskite-type oxides（ABO₃） were prepared and used for the complete oxidation of propylene which is one of hydrocarbons in the automobile exhaust gas. Perovskite catalysts were prepared at different calcination temperatures, and the lower calcination temperature gave the higher activity and surface area of the catalyst. In the case of LaCoO₃ and LaMnO₃, substitution of proper amount of Sr into A-site enhanced the activity, and Co showed higher activity than Mn for B-site. The results were explained with the reducibility of the catalysts. The catalysts doped with the trace amount of Pt showed higher activity and better resistance to sulfur poisoning by SO₂ than those without Pt. The reaction orders were determined, and the orders with respect to propylene and oxygen were increased and decreased with the increase of reaction temperature, respectively.