The new generation of GIS demands the integrated management of vector, image and DEM data. This paper brings forward a vector, image and DEM integrated spatial data model on the basis of the object-oriented idea. It also discusses the implementation method of this integrated spatial database management system. The spatial database management system has been used in the construction of China Spatial Data Infrastructure as the base of a GIS software, GeoStar. It reveals that the system has high efficiency and feasibility to manage national, provincial and city spatial data of multi-scales and multi-sources.