在带权重绝对离差平方和或绝对值和适线准则下，通过引进经验点据权重级别的概念，优化计算频率曲线的统计参数，建立了计算机优化──图解混合适线法。该法能根据资料精度、适线目的以及图解适线的结果，直接调整点据的权重级别，使频率曲线与经验点拟合最佳，从而达到适线的目的。最后，对长江宜昌水文站１８７７～１９８７年共１１１年实测最大洪峰资料以及重现期为８３５年的８场历史洪水按本文提出方法进行水文频率分析计算，以作为实例。 Under the condition of weighted sum of absolute difference or absolute value and criterion of fitness, the concept of weight level was introduced through the introduction of experience points, and the statistical parameters of frequency curve were optimized and optimized. The method can be based on the data accuracy, fit the purpose of the line and the results of the graphical fit, directly adjust the weight of the data points, so that the frequency curve and experience points fit the best, so as to achieve the purpose of fitness. Finally, the hydrological frequency analysis of the Yichang hydrological station in the Yangtze River from 1877 to 1987 with a total of 111 measured flood peaks in the 835 historical floods calculated in this paper is taken as an example.