To study the flow field characteristics of Highway tunnel by roadway construction ventilation, three-dimensional models is built and simulated numerically with the software Fluent based on Liangfengao tunnel in Guizhou province. By studying on the flow field features near the pedestrian cross channel and dealers cross channel with the tunnel in same velocity conditions, analyzing the specific features of the flow field distribution. The simulation results show that the flow field distribution is substantially same near the pedestrian cross channel and dealers cross channel;The velocity in cross-channel is about 10%in the tunnel;The cross-channel velocity distribution and total pressure distribution are consistent Substantially of different velocity;The flow field is relative stability on both sides, so wind volume and pollutants won’t be exchanged.%为研究公路隧道巷道式运营通风横通道周围的流场特性，以贵州凉风坳隧道为研究背景，利用流体力学研究软件Fluent建立隧道三维模型并进行了数值仿真计算。通过在隧道两边等风速条件下，对隧道内人行横通道以及车行横通道附近的流场特点研究，分析了运营通风横通道周围流场分布的具体特点。模拟结果表明：车行横通道与人行横通道两边流场分布基本相同；横通道内风速相对较小，约为隧道内风速的10%；不同风速下，横通道附近的速度分布和总压分布整体走势一致；两边流场相对稳定，不会进行风流和污染物的串流。
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