在土方工程中进行填方、挖方时需要进行断面测量来求得土方量，对井下矿体求其储量则根据断面上钻孔数据来求得。它们的共性是确定空间体的体积，所依据的数学原理都是相同的。本文通过分析得出，这种空间体积问题可转化为在平面上根据离散值求取面积的近似定积分问题，并根据此法对《矿体几何学》中储量的计算方法做了改进。 Filling and excavation in earthworks require cross-sectional surveys to obtain the amount of earthwork, and for borehole orebodies to obtain reserves according to borehole data on the section. Their commonality is to determine the volume of the space body, and the underlying mathematical principles are the same. The analysis of this paper shows that this space volume problem can be transformed into the approximate definite integral problem of obtaining the area based on the discrete values ​​in the plane, and the calculation method of the reserves in the “Orthorish Geometry” is improved according to this method.