Abstract: This study focuses on the independent development of a BIM-based automatic partitioning method for building MEP (Mechanical, Electrical, and Plumbing) modularization, aiming to enhance the efficiency and accuracy of MEP modular design in construction. By integrating an improved genetic algorithm and secondary development in Revit, intelligent partitioning of MEP pipeline modules is achieved. This paper provides an overview of the key technologies involved in software development, including mathematical modeling, optimization algorithms, and software logic. The software system can automatically extract pipeline information from Revit models, dynamically adjust module length, and generate a standardized modular partitioning scheme. The optimized genetic algorithm features customized processing in population initialization, selection, crossover, and mutation stages to ensure that the partitioning scheme minimizes costs while conforming to standardized module lengths and avoiding critical pipeline attachments. Research results indicate that the software effectively avoids critical pipeline attachment locations, generates standardized module lengths, improves prefabrication and installation efficiency, reduces construction costs and provides new technical support and optimization tools for modular design in construction.