Abstract: This paper proposes a refined control design scheme of BIM model for prefabricated MEP system, namely the integrated model of Design Development - Factory Prefabrication - Virtual Prefabrication and Assembly. In the paper, the refined control technology of BIM model for PC MEP system in design development, prefabrication, assembly and installation is introduced in details, and has been successfully applied in practical projects. The refined control technology of BIM model has significantly improved the precision of BIM model, and meanwhile enhanced the construction efficiency as well, which provides a strong guarantee for the accurate PC MEP system installation.