To study the influences of the abrupt change of the wind field around bridge pylon on the train wind load under the action of cross wind ,the main ship channel bridge of the Hutong Changjiang River Bridge was taken as an example ,the flow field distribution around the pylon of the bridge was calculated and analyzed ,using the computational fluid dynamics numerical simula‐tion and the aerodynamic parameter changes of the trains that were traveling in and out of the py‐lon influential area along the different positions of the track under the different wind yawed angles were measured in the scaled‐down large sectional model wind tunnel test .The results indicate that around the pylon area ,there exists the wind speed acceleration or the wind speed abrupt drop area and behind the pylon ,the local back flow phenomenon may occur .The influences of the wind shielding effect of the pylon on the train drag and moment coefficients are obvious ,but on the lift coefficient is not great .Under the different wind yawed angles ,the responses of the trains of the different types traveling along the different positions of the track to the wind shielding effect of the pylon are not accordant .When the wind yawed angles are 10°~20° ,the C80 train that has the rel‐atively smaller size and bluffer section on the windward side track is more sensitive .%为研究横向风作用下桥塔附近风场突变对车辆风荷载的影响，以沪通长江大桥主航道桥为工程背景，采用C FD数值模拟计算分析桥塔区域流场分布，并通过大节段缩尺模型风洞试验，测试在不同风偏角下，列车沿不同位置轨道进出桥塔影响区域过程中的气动参数变化。结果表明：桥塔附近区域存在风速加速或突降区，塔柱后方会出现局部回流现象；桥塔遮风效应对车辆阻力系数及力矩系数影响明显，对升力系数影响不大；不同风偏角下，不同车型在不同轨道位置运行时对桥塔遮风效应响应不一致，风偏角为10°～20°时，相对尺寸较小且截面更为钝化的C80车型在迎风侧轨道上更为敏感。
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