为实现大瑶山隧道地表及地层的三维可视化，重点研究了工程中常用的AutoCAD格式的原始图形文件到地质建模软件所需的高效格式转换方法；以地表等高线和隧道地质剖面原始AutoCAD格式数据为基础，利用三维地质建模软件，建立了武广客运专线大瑶山隧道三维地表、地层和隧道模型。为今后隧道三维地层可视化的进一步研究与开发，奠定了良好的工作基础。

In order to achieve 3D visualization of the ground surface and stratum of Dayaoshan tunnel, the following 2 topics are studied in particular in the paper:  studying on effective format conversion methods so as to convert AutoCAD format graphics files, which are often used in engineering, into proper format files required by the 3D geological modeling software;  Based on the AutoCAD format data of the contour map and longitudinal geological profile of Dayaoshan tunnel on Wuhan-Guangzhou passengerdedicated railway, 3D ground surface model, 3D stratum model and 3D tunnel model are established for the tunnel by means of the 3D geological modeling software. The research lays a sound foundation for further study and development of the 3D visualization of the tunnel stratum in the future.