This paper delves into the innovative auxiliary management role of BIM technology applied in the T5 Station Front Business District municipal infrastructure project of Airport New City. Starting from the core features of BIM technology, namely visualization, data integration and collaboration, it analyzes how BIM addresses key challenges in project management and construction organization. It elaborates on the integrated BIM management platform and Bentley-based solutions, covering applications like engineering cost estimation, clash detection and schedule control, while explaining the auxiliary management effects on technical quality, production and business departments. Also, it points out the challenges in BIM application and corresponding countermeasures, aiming to highlight BIM's significance in enhancing municipal construction management and driving the construction industry's digital and intelligent development.