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How to use the 3D (three-dimensional) modeling techniques better is the core problem in Digital City, which is also a harsh topic during the development of 3D GIS. Key problems in current 3D modeling techniques used in 3D GIS applications are discussed in this paper, and 2D and 3D interactively automatic construction technology of 3D model is presented. It constructs 3D model by extracting the region of the building from the high resolution remote sensing images. Integrating ArcGIS 2D GIS platform and ChinaStar 3D GIS platform, it combines 2D and 3D interactive model adjusting tools and rich libraries of model textures, and can implement automatic construction of 3D model conveniently and efficiently with higher match accuracy between the 3D model and the high resolution remote sensing images and lower technical requirements to the modelers, It provides a feasible plan of the high simulated 3D models automatic construction to achieve Digital City.