It is important to evaluate thermal environmental characteristics and the amenities in a large space such as a building with a performance hall. Because there are sometimes occurred inefficient HVAC system operation and excessive energy consumptions. Especially in a thermal environmental view, people feel thermal displeasure because of temperature differences between vertical and horizontal directions. We have performed thermal environmental characteristics analysis for N Korean performance arts center by using CFD techniques. Consequently we confirmed that supply flow balancing after T.A.B decreased thermal stratification locally and increased people`s thermal comfort. So it is necessary to carry out T.A.B for HVAC system in a large space. And it can be used as a fundamental design data for large space design.