The Tongzhou Cultural Tourist District Project is a construction project invested and constructed by the Tongzhou District Government, which possesses many characteristics of large construction volume, long construction cycle, complex project information and the difficulty of regional coordination. According to the actual needs of the project, a regional collaborative management platform is established based on the BIM+GIS technology to realize the collaborative management of the whole project, the whole staff and the whole profession. The platform adopts a four-tier architecture of user tier, application tier, data tier and service tier, including nine basic modules and three functional application modules. Key technologies adopted in the platform include model fusion, model lightweight, VR display and 3D rendering. Through the application of the platform in Tongzhou Cultural Tourist District project, the feasibility and value of such platform in improving the level of regional construction collaborative management are verified.