<正>分析长江中下游地区与洪灾密切相关的环境特征，揭示了环境对洪灾的影响规律，指出气候、地形地貌和土壤等是诱发洪灾的自然因素；森林对防洪减灾有巨大作用；水土流失加剧了洪灾发生频率和潜在威胁。最后，对生态环境建设中质量问题、退田还湖、三峡水库的防洪减灾作用等进行了讨论，提出了自己的观点。

The paper analysed the envirnoment characteristics that influenced the flood in the middle and lower reaches of Changjiang River, and revealed the rule of the flood affacted by its environment. It indicated that climate, topography, soil etc. were the natural factors which caused the flood, forest played an important role in anti-flood, water and soil loss increased the frequency and potential threat. At last, the paper discussed several problems, and raised different views. More attention should be given to the quality of ecological environment construction. It wasn’t necessary to return the cultivation land into the lake. The Three Gorger Reservoir was going to play a limited role in fighting the flood of the area.