Abstract: Through the research on natural environment of Three Gorges Reservoir Area，some conclusions are drawn：acid fall is very frequent；some environment~ctors(especially hmnidity)of reservoir area may accelerate corrosion efect on bridges； the steel of bridges is corroded easily；the types of steel corrosion include the steel reinforcement corrosion of general concrete， the steel reinforcement corrosion of prestressed concrete and the COrOsion of other steel materials．In addition，concrete material of bridges occurs corosion efect with acid medium of its environment．

Key words: Three Gorges Reservoir Area, acid fall, bridges, corrosion efect

摘要： 通过对三峡库区自然环境条件研究表明，三峡库区酸沉降频，库区的一些环境条件(尤其是湿度)对桥梁等建 筑物的腐蚀效应有加速的作用，库区桥梁中钢材最容易受到腐蚀，其腐蚀可分为一般砼中钢筋的腐蚀、预应力砼中 钢筋的腐蚀及其它钢铁材料的腐蚀，此外，桥梁中的砼材料d王会与环境的酸性介质发生腐蚀．

关键词: 三峡库区, 酸沉降, 桥梁, 腐蚀