Abstract: The manual disassembly method for traditional mechanical and electrical installation BIM models faced challenges such as low efficiency, frequent errors, and poor data flow. This study designed and developed a set of automatic disassembly method of BIM model based on Revit secondary development in subway electromechanical installation engineering. According to the mechanical and electrical installation process, the splitting rules are defined. In Revit software, the model components are first classified, and then the pipes, air pipes and bridge systems in the electromechanical BIM model were separated one by one, and the components are uniquely coded and assembled. The project data and information were uploaded and shared after disassembly. Moreover, the detailed drawings were released with one click, and the component could be directly manufactured without secondary deepening. The results showed that the whole plug-in system was stable and the plug-in response speed was fast. The efficiency was greatly improved compared with manual method. The plugin developed in this study implements component disassembly, uniquely encodes information for each component, assigns positional information to components, and exports disassembly details to Excel in a tabular format.