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中文摘要：
作者应用水患频率五年滑动平均数法，分析了清乾隆初年至公元1911年间太原阳曲两县水患频率的增长情况,指出：乾隆初年fd=0.085，fd〈0．2水患较轻，但以后逐步加剧，至清末0-2〈fd〈0．5灾情已相当严重，同频率的特大洪峰增大了一倍以上．分析认为这与汾河上游人口增加、耕地扩张有一定联系．
英文摘要：
With the application of five-year slide average of flood frequency alytical method,the authors analyse the flood in Taiyuan and Yangqu from the first years of Qianlong period of Qing Dynasty to 1911. They state that the flood in the beginning of Qianlong period was slighter,but it became more serious increasingly in the end of Qing Dynasty,and the great flood peak of the same frequency became twice as big as that of past time. The result is related to the increasing of the population in the upper reaches of Fenhe River and the extending of plantation there.
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