Abstract: The Building Information Modeling (BIM) model for subway buildings has the characteristics of large volume, high component repetition rate, and regular appearance. Aiming at the low efficiency of its Web side model loading and rendering, which could easily lead to browser jams, page crashes, and other issues, this paper proposed a subway BIM model Web side lightweight strategy and load optimization method. Experiments show that using appropriate model lightweight methods can greatly reduce the number of patches in complex architectural models, reduce model storage consumption, and combine visual cone culling algorithms to effectively improve rendering frame rate and user interaction fluency.