Abstract: Targeting the unsafe behavior of construction site personnel, safety early warning system of metro construction accidents is established based on BIM Technology and positioning technology. The four level structure of the system is analyzed, mainly including: acquisition layer, input layer, processing layer and application layer. The system takes BIM as the underlying twin data, using positioning technology to collect real\|time positioning data, on the basis of real\|time personnel positioning, automatic warning identification and analysis of dangerous areas, an integrated management platform is developed, so as to achieve intelligent management and control of personnel safety behavior based on BIM and positioning technology integration.