Abstract: The multi-scale modeling of the aground-underground integrated space is the key technology for digital mine, digital city and digital geotechnical engineering. Analyzing the multi-scale geoscientific data, they were partitioned taking account of semantics so as to develop a series of multi-scale models, inclusive of semantic differences. Integrating the seamless modeling with multi-scale modeling, an architecture based on the 6-level LOD (level of detail) of the aground-underground integrated multi-scale monolithic modeling was proposed, which was implemented on the software platform Geos3D V1.0. Experimental application results showed that the method of aground-underground seamlessly integrated multi-scale modeling with semantics taken into account can take full advantage of geoscientific data to model the aground, surface and underground objects integrally, thus providing a new technological approach to the seamlessly integrated multi-scale modeling for geoscience.