Abstract: AutoCAD Civil 3D is a popular civil engineering software with powerful threedimensional modeling for the computer aided design. This paper presents a case history of using this software in the excavation of a high syncline cut slope in Guanling Formation in Guizhou area. The AutoCAD Civil 3D was used in modeling the complicated 3D geological conditions. The weak zones in the soil/rock mass would be able to be identified and mechanical parameters of the weak zone were back analyzed. As a conclusion, this software was successfully provide the guidance in the cut slope design and construction and provided an early warning for the potential landslide hazard.

Key words: AutoCAD Civil 3D, 3D modeling, Early Warning for Landslide Hazards, Design and Construction