传统工程地质资料的描述和解释直观性差，往往不能充分揭示地质构造空间变化的规律，所以越来越难以满足设计人员进行空间地质分析的要求，文章利用GIS和可视化技术，提出了水电工程地质信息数字化与三维可视化方法，实现了地质信息的可视化分析，工程应用表明该方法可为直观描述复杂地质构造的空间展布及其相互关系，以及进行工程地质交互设计提供有效的途径。

As the traditional description of engineering geoinformation is lack of visualization, and can not reveal the spatial tendency of geological structures very well, it is more and more difficult to meet the designers' demands for making geological spatial analysis. By using GIS and visualization techniques, a method of geological digital 3-D modeling and its visualization in hydroelectric engineering is presented in the paper, aiming at making the analysis of geoinformation visual. With an example of engineering application, it has been shown that the method gives an effective way to describe the spatial distribution of geological structures and their complex relationship so that the engineering design can be executed interactively and conveniently.