铁路虽有安全、量大、舒适、方便的优势 ,由于当前交通运输业竞争激烈 ,因此必须提高运行速度到 140 km· h- 1 或 16 0 km· h- 1 以缩短旅客在途时间。我国铁路桥梁均按 12 0 km· h- 1设计。文中主要对既有桥梁提高行车速度后桥梁振动的变化和车辆过桥时走行性及应采取的对策进行了理论和实测研究分析 Despite the safety, large amount, comfort and convenience of the railway, due to the current intense competition in the transportation industry, it is necessary to increase the operating speed to 140 km · h -1 or 160 km · h -1 to shorten the passenger’s transit time. China’s railway bridges are designed by 12 0 km · h-1. The paper mainly analyzes the changes of the bridge vibration after the bridge has been increased its traveling speed and the walkability and the countermeasures that should be taken when crossing the bridge.