扩散波概念的提出至今已有近半个世纪。在前人研究的基础上，着重讨论如何把扩散波解析解用到天然河道的洪水演算中去，即通过把入流过程离散成带常系数的单位矩形入流之和，将单位线概念引入具有自由下边界的线性扩散波洪水演算模型，并给出了确定天然河道Ｃｋ和μ的实用方法。用于黄河下游６个河段的洪水演算获得了令人满意的成果。扩散波洪水演算模型，继承了水力学方法的长处，又具有水文学方法的优点，可能有较好的开发应用前景 The concept of diffusion wave has been proposed for nearly half a century. On the basis of previous studies, we focus on how to use the analytic solution of diffusive waves in the flood calculation of natural rivers. That is, by dividing the inflow process into a unit rectangle with constant coefficients, The lower boundary of the linear diffusion wave flood calculation model, and gives a practical method to determine natural river Ck and μ. The flood calculation for the six reaches of the lower Yellow River has yielded satisfactory results. Diffusion wave flood model, inherited the strengths of hydraulics, but also has the advantages of hydrological methods, may have better prospects for the development and application