Abstract: This article explores the next generation of BIM full-lifecycle massive data management agent technology, driven by a dual engine of BIM-specific database and AI big model. Different from the BIM data management mode based on model files, the BIM special database integrates the most advanced NewSQL and NoSQL technologies. The database is fully and accurately managed to each BIM component, part, including attribute / attribute set, geometric topology and association relationship. The BIM-specific database provides a unified structured query (SQL) interface to make business chain calls for full-lifecycle applications as simple as possible. Moreover, based on the text processing capabilities of the AI large model, users can directly interact with the dedicated database based on natural language to query and obtain the required BIM data or sub-models. The BIM data management agent, powered by the BIM-specific database and AI large model, can improve quality and efficiency in a variety of BIM application scenarios, including collaborative design, construction management, collision detection, fast quantity calculation, and asset management.