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Oxygen storage performance is modeled with the goal of optimizing the performance of three-way catalysts and developing an on-board catalyst degradation diagnosis (OBD) system. Oxygen storage performance is closely correlated with catalyst performance and degradation, and thus can serve as an excellent indicator for accessing the performance of catalysts[1, 2, 3, 4, 5 and 6]. In experiments using actual exhaust gas, it was found that the rate of oxygen storage and discharge under actual operating conditions exhibited sufficiently fast chemical reactions and were dependent on the supply rate of reactant species. We also found that the higher the catalyst temperature, the greater the oxygen storage capacity. These experimental results were modeled in a general control system development tool environment.