Abstract: Addressing the issues of the lack of formal expression in existing achievements of the bulildings 3D model, the uniformity of facade information scales acquired by different disciplines, and the absence of specific norms for collection content, this paper constructs a normative description of building facade feature elements and their relationships from three scales: block, individual building, and wall. It proposes a multi-scale graph structure representation method for building facade features based on the hybrid graph model, which realizes multi-scale feature description of building facades. An experimental area is selected, and relying on Neo4j graph database technology, the construction of a multi-scale feature model for buildings is achieved through spatial multi-scale construction, facade feature entity construction, and relationship construction. The results indicate that by storing relevant information about the exterior facades of urban buildings in a graph database, data integration can be achieved, making originally dispersed and difficult-to-manage data centralized and orderly. The establishment of a graph structure database promotes data sharing and improves the efficiency and utilization of information flow.

Key words: 3D real scene, building facad, graph structure, multi-scale feature