传统的水库库容计算方法难以快速、准确地计算出大型水库库容值，满足不了水库运行调度的需求。为此，利用空间信息技术，在采集和构建高精度的水库地形数字高程模型（DEM）的基础上，结合GIS组件二次开发技术，对水库库容的精确计算提出了一种新方法。运用该方法编写通用的库容计算软件平台对三峡水库静库容和动库容进行了计算，计算结果较为准确，表明该方法准确有效，可以在其它具有地形DEM数据的大型水库推广运用。

It is very difficult to calculate the large scale reservoir storage rapidly and accurately by the traditional calculating method of reservoir storage, and the result can't meet the request of the reservoir regulation. On the basis of the spatial information technology, this paper presents a new method of calculation of reservoir storage by gathering the precise terrain data of the reservoir and establishing reservoir watercourse DEM. From the method, the software system of reservoir storage calculation has been developed and used to calculate the static reservoir storage and dynamic reservoir storage of the Three Gorge Reservoir. The calculation results are quite accurate, which indicates that the method is feasible and can be used for the other large scale reservoirs that have the terrain DEM data.