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WU Hua lin,SHEN Huan ting (The state key laboratory of estuarine and coastal research,East China Normal University, Shanghai 200062,China)  
Flood is a serious calamity. The paper analyses the characteristics about flood development in China with lots of data and concludes that flood in China developed with the characteristics of high frequency and huge destruction recently. Based on it, the paper describes the mechanism of flood calamity and divides the cause of flood into two parts: natural factor and human factor. Natural factor includes three aspects, i.e., geographical condition, climate characteristic and effect of abnormal astronomy activities. Conclusion that it is the basic situation of China to develop economy with high risk of flood clammily in a long term is presented as an outcome of research on the natural factor. Human factor is the negative influence of humanity activities, including degeneration of lakes restoring capacity for floodwater, water and soil losing, barrier in watercourses, low flood control criteria of dykes, which is apt to bring about flood damages. In view of the complexity of causes of floods in China, the paper proposes that the ecological measure, engineering measure, administration measure, science and technology measure should be synthetically carried out in order to control flood calamity in the future.
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