Considering natural ventilation in Subway tunnel fire, this paper adopted FDS software to simulate numerically the influence of different aspect ratios, overburdens and opening forms of ventilation shaft on natural ventilation. Results indicated that the natural exhaust effect of the ventilation shaft with 1.25 to 2.5 aspect ratios was better than the ventilation shaft with aspect ratio 5; that overburdens at 5 m to 15 m range for ventilation shaft bad no obvious influence on natural ventilation; and that the straight ventilation shaft had a better natural exhaust effect than the diverging ventilation shaft.%针对地铁区间隧道火灾的自然排烟,采用FDS(fire dynamics simulator)软件,数值模拟通风竖井的长宽比、埋深和开口形式对自然排烟效果的影响.模拟结果表明:当通风竖井的长宽比在1.25～2.5时,其自然排烟效果明显好于其长宽比为5时的自然排烟效果；当通风竖井的埋深在5～15m时,对自然排烟的影响不明显；采用直通风竖井的自然排烟效果优于采用渐扩通风竖井的自然排烟效果.
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