Abstract: On the premise of in-depth study of traditional security hazard investigations, a process for the investigation of hidden dangers based on information technology has been proposed, and a set of safety management systems adapted to the investigation of hidden dangers have been established, combining BIM, face recognition, personnel positioning, and physical Networking and other technologies have developed a set of hidden danger investigation management system that effectively solves the pain points of safety management at subway construction sites. Through the promotion and trial on Guangzhou Metro Line 11, it has been proved that false investigations, semi-closed loops, and unclear responsibilities in the investigation of hidden dangers can be effectively eliminated. To achieve a series of changes from on-site management and control to back-end remote management and control, and to extensive management and control to fine management and control.