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利用中国历史水灾数据，提出用“受灾比”（ＦＰ）表示流域内受灾县域个数占整个流域县域个数的比例。对各大流域ＦＰ时空动态变化及其风险水平的分析结果表明：ＦＰ及相应的风险水平有明显的南北差异，ＦＰ平均月变化和年变化跟降水变化和人类的开垦活动密切相关。
Using the data of historical floods in China, we propose that the “disaster-hit ratio” (FP) is used to indicate the ratio of the number of affected counties in the basin to the number of counties in the entire basin. The results of spatio-temporal dynamic changes and their risk levels in major watersheds show that FP and corresponding risk levels have obvious north-south differences. The average monthly and seasonal variations in FP are closely related to the changes in precipitation and human activities in reclamation.