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The characteristics of a hybrid air-conditioning system, utilizing natural and mechanical ventilation, is investigated in an office setting. The characteristics of the indoor environment are examined with CFD(Computational Fluid Dynamics) simulation under various conditions of air-conditioning types and interior conditions of office. The control of the room air conditioning system (VAV system) is included in the calculation through changing the supply air volume to keep the task zone temperature at a target temperature. Underfloor air conditioning type is more helpful to energy conservation than ceiling air conditioning type. When the indoor heat generation rates increase, the inflow jet flows deeper into the room and mixes well with the indoor air. A vertical temperature gradient appears at the task zone with the rise in the indoor heat generation rates. The cooling load of the mechanical AC system increases with the decrease of the vertical width of inflow opening. Though the cooling load of the mechanical AC system increases with the increase of the width of office, its increasing rates is slower than that of perfect mixing assumption. These data can be utilized to estimate the effectiveness of hybrid air-conditioning system.