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伴随着卵石推移质输移量沿程递减，卵石推移质粒径随之减小。粒径减小的物理成因十分复杂，因此原型观测非常重要。测验工作量很大，因此本文提出了一种在取得上、下游两测点粒径资料后，计算区间任何断面粒径的计算方法。该方法采用了仙农熵（Ｓｈａｎｎｏｎｅｎｔｒｏｐｙ）的概念，以粒径的概率分布为基础，通过最大熵原理和变分法得出了粒径沿程变化的计算式。用该方法计算寸滩、万县、奉节的卵石推移质粒径，得到了满意的结果。
Accompanying the gravel transport along the grading, the grading of the pebble mass decreases. The physical causes of particle size reduction are complex, so prototype observation is very important. Therefore, this paper presents a calculation method for calculating the particle size of any cross section after obtaining the particle size data of the two measuring points at the upper and lower reaches. This method uses the concept of Shannonentropy. Based on the probability distribution of particle size, the formula for calculating the variation of grain size along the path is derived by the principle of maximum entropy and variational method. By this method, the grading parameters of gravel of Cuntan, Wanxian and Fengjie were calculated, and satisfactory results were obtained.