We presented the development of the physical model of a subway tunnel under Yangtze River by using CFD technology,and the numerical simulation of the fire in the tunnel by considering the practical smoke control design. The flume temperature field and concentration field with different working conditions under the longitudinal smoke extraction control mode were obtained. The actual effects of smoke extraction under various working conditions were analyzed,and a safety evacuation strategy under fire emergency condition was proposed. The result provided a reference for the disaster prevention design of subway tunnels under Yangtze River.%利用CFD技术，以地铁过江隧道为研究对象构建物理模型，结合实际防排烟系统设计方案，对隧道火灾进行数值模拟，得到纵向排烟模式下不同工况的烟气温度场及浓度场，对比分析各种工况下的实际排烟效果，提出火灾紧急状况下人员安全疏散策略，为地铁越江隧道的防灾设计提供可借鉴的依据.①
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