分析了烟气在中庭式建筑内的充填特点，并在中国科学技术大学和香港理工大学合建的大空间火灾实验厅内进行了对比试验．实验和计算结果表明，中庭内，烟气的充填过程很快，在烟气层形成的开始阶段的下降速度约为０．２ ｍ／ｓ，８ ｍｉｎ 左右接近地面．用区域模型计算烟气的充填过程仍具有足够的精度． The filling characteristics of the smoke in the atrium building were analyzed. A comparative experiment was conducted in the large space fire experimental hall jointly built by the University of Science and Technology of China and the Hong Kong Polytechnic University. The results of experiments and calculations show that the filling process of smoke is very fast in the atrium. The speed of decline at the beginning of the formation of the smoke layer is about 0.2 m/s, and it is close to the ground at about 8 min. Calculating the filling process of flue gas with the regional model still has enough accuracy.