针对试验研究资料画在有关函数的坐标纸上仍然不是直线关系的情形，介绍了找经验公式的简便方法。作为实例，选择了水力学和土力学中常用的关系曲线，它们分别是点绘在双对数、半对数和普通方格纸上的。借此三例典型曲线，叙述了求经验公式的简便方法过程，并求得相应曲线的球体潜水运动力系数公式，泥沙沉降速度公式，软土地基沉降固结度公式和给水度公式。

In this paper, the simple method to find empirical formula using the experimented and researched data to be plotted on the coordinate paper of related function not to form a straight line is introduced. As examples, the relation curves plotted on log-paper, semi-log paper and ordinary coordinate paper in hydraulics and soil mechanics were selected. With these three typical curves the procedure of simple method to find empirical formula is stated . Consequently the formulas of drag coefficient for an immersed sphere body moving through water, settling velocity for silt and sand , settlement consolidation degree for soft foundation and storativity are obtained.