The research took Hainan Island as the example, shows how to carry out 1: 500 000 3D hillsha-ding geological mapping based on DEM and by jointly using the Global Mapper, ArcGIS and MapGIS softwares. Firstly, make automatic registration between SRTM DEM data and 1:500 000 vector geographic data under different map parameters; secondly, overlapped the geological elements with the DEM; third, rectified the geological dividing line of Quaternary System, realized the production of the 1: 500 000 Hainan Island 3D geological mapping. The present research also summarizes the methods about data conversation between different ellipsoid bodies and coordinate system, about filling up the black area of the DEM data and production the 3D geological map and so on. The DEM data used in the research satisfy 1:500 000 geological mapping requirement, and the 3D geological map has enhanced the stereoscopic effect and readability of the map, improved the accuracy and information of geological maps, and made the map more clear in three-dimensional geological structure when compared with the traditional geological map. It can provide a new method and way for Chinese geological mapping and for other 3D maps production.%将Global Mapper、ArcGIS、MapGIS三款GIS软件有效结合起来,以海南岛为例进行基于DEM的三维晕渲地质图的制作方法研究.首先将SRTM数据和矢量地理数据在不同地图参数下进行自动配准,然后实现地质要素与DEM模型的精准匹配,最后根据DEM对第四系地质界线进行微调,实现了1∶50万海南岛三维地质图的制作.同时总结了不同椭球体与坐标系统下的数据转换、DEM空白区数据填补、晕渲地质图生产的方法.三维地质图制作所采用的DEM数据完全满足1∶50万三维地质图的制图要求；与传统地质图相比,其立体感和可读性明显增强,图件信息量显著增大,图面呈现清晰的三维地质结构,很好地提高了制图精度.该方法为我国三维地质图的制作提供了一个新的方法和思路,并为其他三维图件制作提供了参考借鉴.
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