简要介绍了系统相似性度量中的非平权距离系数法，并将其应用于水文计算中相似流域的选择。
The paper briefly presents the method of uneven weight distance coefficient for the measurements of system similarity and introduces it to the choices of analogy basins in hydrologic calculation.
无资料地区设计洪水的区域频率分析包括选择相似流域组、估计指标洪水以及推求区域综合增长曲线和设计流域的洪水频率曲线。
Regional flood frequency analysis for un-gauged basins included selecting a pooling-group, estimating the index flood, deriving pooled growth curve and fitting flood frequency curve for tested basin.
区域频率分析能充分利用相似流域组的资料来扩充信息量，克服单站样本系列资料短缺的局限，解决无资料地区设计洪水的估算问题。
Regional flood frequency analysis is a useful approach method that avoids the shortness of at-site sample series and estimates design flood for un-gauged area.
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