The study on the characteristics of nitrous oxide catalytic decomposition was carried out to utilize the nitrous oxide as a propellant. The Pt, Ir and Ru were synthesized to select a high performance catalyst for the nitrous oxide decomposition reaction. The respective catalyst precursors were loaded in the Al2O3 support using an wet impregnation method. The N2O conversion as a variation of space velocity and reaction temperature was measured using a tubular reactor. The catalyst loss was measured to evaluate the durability of catalysts after the reaction at 800 o C for 2 hours. The N2O conversion was increased at the decrease of space velocity and at the increase of temperature. The Ru/Al2O3 catalyst had the highest N2O conversion at low temperature and the best durability.