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In this paper， the relationship between ventilation efficiency and air outlets ！ return −intake systems in atrium space were analyzed by experimenta 監 studies and also by numerical simulation based Qn computational fluid dynamics ( CFD ) ． The conclusions are as fbl 豆 ows ； 1． In the case ofcoGling and the occ 叩 ied zone be藍 ng limited the venti 且 ation efficiency has increased by arranging the supPly outlets at the 艮 ower part ofthe atr 孟 um ． 2 ， In the case ofavertical supply from the floor ， a exhaust system at the ceihng is more desirable than tbat of the wall ． 3． Effective arrangements fbr both the heat 重 ng and the coGhng modes are to supply the air from the wall at a height of 3500mm and exhaust