Abstract: Objective: Aiming at the monitoring problems and difficulties in the construction process of deep foundation pit works for subway station, the twin simulation cloud platform for deep foundation pit works based on BIM (building information modeling) technology is studied. Method: The architecture and main functions of the twin simulation cloud platform system for deep foundation pit are introduced, and the interface between the platform system and numerical calculation software is studied. Taking a deep foundation pit project in Shanghai as an example, the core content of the project based on the twin simulation cloud platform for deep foundation pit engineering is elaborated (including the establishment of a twin lightweight model for deep foundation pit, the establishment of a monitoring point model family library, and monitoring and warning schemes). Taking the underground continuous wall structure as an example, the transformation of the twin model and numerical model, as well as the application of examples are explained. Result &Conclusion: The platform system can visually and intuitively generate various types of data reports and analysis curves, which can better meet the needs of rapid processing and information feedback of deep foundation pit monitoring data. This platform can achieve functions such as digital twinning of deep foundation pit models and monitoring points, real\|time input, storage, processing, and warning control of measurement point information, transformation and analysis of digital twinning models and numerical analysis models, and propose reasonable construction plans to improve construction efficiency.