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Three-dimension spatial data is the most restriction of 3DGIS development. Although CityGML is a kind of open 3DGIS data model, the key factor of 3DGIS application successfully is how to construct 3D spatial data quickly. This paper proposes a method to construct 3D spatial data effectively based on ontology. Lod0-Lod4 Geometrical models are constructed on the SketchUp platform easily. Topological model, appearance model and semantic model are constructed through computer-aid system which is developed with an open source project CityGML4J library and Obj which is used to read-in three-dimensional coordinate. Then, the models are exported as CityGML files and all these files are imported into a relation database. By the supporting of web service technology, 3D spatial data is published on network. The results show that the approach acquires 3D spatial data fast and it will apply in a variety of fields in 3DGIS.