摘要：To improve the reusability of three-dimensional （3d） models and simplify the complexity of natural scene reconstruction, this paper presents a 3d model database for universal 3d GIS. After the introduction of its extensible function architecture, accompanied by the conclusion of implicit spatial-temporal hierarchy of models in any reconstructed scene of 3d GIS for general purpose, several key issues are discussed in detail, such as the storage and management of 3d models and related retrieval and load method, as well as the interfaces for further on-demand development. Finally, the validity and feasibility of this model database are proved through its application in the development of 3d visualization system of railway operation.