Catalytic combustion of propane-air mixture was investigated. Platinum catalysts over a flat stainless steel with γ- alumina washcoat were employed. The employed burner has three catalysts set parallel to the mixture flow, spaced at an interval of 5, 10 and 15 mm. Both experiment and numerical simulation were made at inlet temperature of 553 K, inlet velocity of 3 to 7 m/s and equivalence ratio of 0.3 to 0.5. In the numerical simulation, two-dimensional,. steady state model was developed to calculate the temperature and species concentration in gas-phase. In this model, chemical reaction on the catalyst surface and that in the gas phase were assumed to occur in three-steps. The numerical results show good agreement with experimental results. It was found that the properties of the catalyst strongly affect the catalyst surface temperature. Especially, the thermal conductivity of catalysthas a great effect, while the emissivity of catalyst has less effect. Catalytic combustion of propane-air mixture was investigated. Platinum catalysts over a flat stainless steel with γ-alumina washcoat were employed. The employed burner has three catalysts set parallel to the mixture flow, spaced at an interval of 5, 10 and 15 mm. Both experiment and numerical simulation were made at inlet temperature of 553 K, inlet velocity of 3 to 7 m / s and equivalence ratio of 0.3 to 0.5. In the numerical simulation, two-dimensional,. Steady state model was developed to calculate the temperature and species concentration in gas-phase. In this model, chemical reaction on the catalyst surface and that in the gas phase were assumed to occur occur in three-steps. It was found that the properties of the catalyst strongly affects the catalyst surface temperature. Especially, the thermal conductivity of catalysthas a great effect, while the emissivity of catalyst has less effect.