空间数据表示方法和空间数据插值方法是3D－GIS研究的基本问题。文中采用基于地学复形的3D空间数据表示方法，对地学目标抽象表示为点，线，面和体４种类型，提出了基于地学复形空间的表示方法。为解决可视化和目标体重建问题，分析了基于地学复形的各种插值方法。在华北地区钻孔地层厚度等值线生成的应用中，三角网插值方法比其它插值方法更符合地质规律。

The method of data presentation and interpolation is a basic issue in 3D GIS, which will affect the management of spatial data and spatial analysis. It's a key problem for many functions of 3D GIS. Comparing several spatial data presentations, on the base of others research, the authors propose the simple based geospatial data presentation, abstract geoobjects as point, line, surface, and body. Then their logical design and topological relation are given. For visiualization and rebuilding of geoobject, simple based interpolation methods are introduced.