Abstract: Based on several kinds of geotechnical engineering information obtained from multiple sources and different structures， such as drilling hole detection， standard penetration test， topographic surveying etc.， a series of specific methods for data preprocessing， integral modeling， 3D visualization and information management of the engineering sites were intensively inverstigated. Based on these methods， a software was developed， by which the stereo space of a geotechnical engineering site， including spatial objects such as topography， buildings， boreholes， stratum， groundwater etc.， can be integrally modeled and visualized with threedimensional models. These 3D models can facilitate functions such as attribute query， information updating and section analysis. The 3D integral modeling software was proposed as a new pattern of geotechnical engineering report beyond traditional 2D report. The software has been applied to several geotechnical projects， whose results demonstrate that the stereo space model of a geotechnical engineering site can be automatically and conveniently reconstructed. The 3D integral modeling and visualization methodology presented contribute a lot to 3D information technology development of geotechnical engineering.

Key words: digital city, geotechnical engineering, 3D geological modeling, integral modeling, 3D visualization, spatial information management