Aiming at a huge underground commercial building. And based on FDS. The smoke solutions for surrounding corridor of sunken plaza and the distribution of mechanical smoke exhaust vents for the underground commercial street adjacent to the sunken plaza were studied. It was suggested from the simulation results that the enclosure sunken plaza's surrounding corridor should naturally ventilate through the windows in the roof; the mechanical exhaust vents should be located 20 - 30 m to the smoke barrier between the sunken plaza and underground commercial street, so as to reduce the air flow turbulence in sunken plaza caused by the smoke exhaust system in commercial street, and form a better air flow to ensure the efficiency of ventilation in sunken plaza.%针对某超大型商业建筑群,采用FDS研究下沉广场环廊区排烟方案及其相邻地下商业街的机械排烟口布置方案.根据模拟结果的对比分析,建议下沉广场环廊区利用其顶部的自然排烟窗排烟；地下商业街内最近排烟口离地下商业街与挡烟垂壁的水平距离应为20～30 m,此时地下商业街的机械排烟系统对下沉广场的气流扰动明显减小,下沉广场内的大部分空气通过上部排烟口形成良好对流,能够保证下沉广场的有效排烟.
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