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中文摘要：
由于水文样本如汛期坝前最高水位系列常为负偏态分布，用传统的频率配线计算，则相应的理论累积频率曲线与经验点的分布差别较大．本文分析了在样本系列出现负偏态时求解理论频率曲线的方法，其配线效果较好．考虑水库汛期最高水位分布常为负偏，和上、下端区间为有限的情况，本文提出引用多项式拟合经验点的概率理论频率曲线，经过初步检验，效果较好．
英文摘要：
Because the maximum stage behind dam in flood period is often in negative deviation, the difference between the theoretical and empirical frequency plotting is bigger when making curve fitting computation with the traditional frequency. This paper introduced a method of attaining theoretic frequency curve when the sample series are distributed negative deviation, which has got a better effect. Considering the maximum stages in flood period are usually distributed in negative deviation with the upper and lower extremities, this paper proposed polynomial curve fitting match the empirical frequency plotting.
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