The exploding urban population multiplies the traffic pressure? So the subway becomes the public transportation means essential to metropolises. Abnormal conditions of subway operation attract more and morce attention. The paper applied CFD to establish a physical model, simulating the hot environment(I. E. Illumination, auxiliary facilities,heat Emission of human bodies, etc)around the air-conditioned train in case of blocking conditions in the subway tunnel, and sought the numerical solutions to the blocking conditions of 3 types of tunnel's (I. E. .circle, ..rectangle and U-shaped). Conclusions are drawn as follows: Ventilation lowers the temperature inside the tunnel obviously;Under the same conditions, the temperature in side the rectangle tunnel reaches the highest, and then follows the circle tunnel and lastly the U-shaped tunnel; Under the same ventilating speed, the temperature above the top of the vehicle depends on the height between the vehicle to Pand tunnel top; For the circle and U-shaped tunnels, normal air-conditioning operation needs a ventilating speed of at least 2m/s whereas for the rectangle tunnels, the ventilating speed should be above 2 m/s.%城市人口的激增使得交通压力倍增,地铁成为大型都市必备的交通运输工具,地铁运行过程中的异常工况也日益被人们关注.本文和用CFD技术,建立模拟地铁隧道区间发生阻塞工况时空调列车周边热环境(照明、辅助设备、人员散热等)的物理模型,对圆形、矩形及马蹄形3种不同截面形状的隧道阻塞工况进行数值求解.结果表明:通风使得隧道内的温度明显下降.相同条件下,隧道内温度矩形隧道最高,圆形隧道次之,马蹄形隧道最小.在相同通风风速下,车顶上方温度主要取决于车顶距离隧道顶部的空间高度；对于圆形截面隧道和马蹄形截面隧道,要始终能保持空调正常工作,通风风速至少要达到2 m/s,而对于矩形截面隧道必须大于2 m/s.
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