在综合国内外相关研究的基础上,提出了径流时空分布理论,该理论基于流域数字高程模型(DEM)获得的数字化流域单元网格,并以线性汇流假定为基础,已成功应用于湿润地区的径流相关性研究中,显示出明显的科学意义和强大的实用功能.为进一步验证该理论在干旱半干旱地区的适用性,还将理论具体应用于黄河流域的无定河流域的径流相关性分析中,并获得了初步有效验证. On the basis of relevant researches both at home and abroad, this paper presents a time-space distribution theory of runoff based on the digitized watershed element grids obtained from DEM and based on the assumption of linear convergence, it has been successfully applied in humid regions In the study of runoff correlation, it shows obvious scientific significance and strong practical function.To further verify the applicability of this theory in arid and semi-arid regions, this paper also applies the theory to runoff correlation analysis of Wuding River Basin in the Yellow River Basin , And obtained the initial valid verification.