The oxidation kinethics of BTX mixtures were studied on a 0.5% Pt/ -Al₂O₃ catalyst phase at temperature ranging from 200 to 350℃. An approach based on the Mars-van Krevelen rate model was used to analysis the results. The objective of this study was to depict the kinetic behavior of the platinum catalyst for deep oxidation of BTX mixtures. The conversions of BTX were increased as the inlet concentration was decreased and the reaction temperature was increased. But in case of the BTX mixture, mixed compounds acted as inhibitors each others, and in the trends of that benzene inhibited stronger than others.