中文摘要：

分析了钢箱梁桥体遭受破坏两个主要原因：腐蚀与桥面铺装层的热稳性。提出了钢箱梁降温除湿系统，介绍了系统的工作原理与工作的优越性。

英文摘要：

The paper analyses the main reasons of steel deck pavement Bridge＇s destroy （cauterization of the steel box and thermostablity distresses of bridge deck pavement）, Cooling and dehumidifying system and its air distribution in steel box girder is designed. The operating principle and the advantage of the system is studied.