Abstract: The computer aided underground mining design and solid modelling system 3DMGS is developed under AutoCAD for Windows. The computer aided design and plot-ting tools are developed according to the mining design standards, the database of the shafts and drafts is built in the system, and the designed objects can be identified and their geomtric parameters can be recorded automatically to the database from the design map. By making use of AME (AutoCAD Modelling Extention), the visual solid modelling system of shafts and drafts structure engineering is developed. With the application of 3DMS, the efficiency and quality of design work can get improved greatly.