Aiming at the problems of many electrical professional systems in assembly engineering project，high requirements for construction refinement，and easy exposure of design defects of prefabricated units and construction，BIM modeling and research in electrical engineering is conducted. A set of informationized and refined BIM modeling methods for hierarchical management of electrical systems is adopted，and effective explorations have been made in improving professional collaborative design of modeling and improving the life cycle of assembly-type industrialization.The engineering practice shows that the set of BIM-based modeling system is more suitable for the prefabricated electrical design and can guide construction and prefabricated component production.