Abstract: Today, the application of digital twinning technology in industries is accelerating. Since 3D geographic information (3D GIS) model is one of the indispensable basic data models of digital twinning technology, the necessity of developing 3D GIS model management platform with independent intellectual property rights is self-evident. By referring to the open source geographic information framework Cesium and using Java and JavaScript languages, open source code and domestic model conversion tools, the 3D GIS model management system based on Web is developed, and key technologies such as LOD calculation, model merging and serialization, rendering optimization, model compression and decompression, and customized control of scene roaming are realized. This system can convert oblique photograph taken by unmanned aerial vehicle into 3D GIS models browsed via Web browser, support large-volume 3D GIS model data management, facilitate users to efficiently complete scene editing and model rendering, provide safe and simple data sharing interface to enable seamless integration with other information systems. Besides, it can provide digital twin resources required for the development of various business applications and facilitate the integration of relevant data to empower business improvement by using spatial models as the carrier of various business applications.