Methodologies of safety risk control for China's metro construction based on BIM

China's metro construction accidents have occurred frequently due to the lack of effective safety risk control in the context of large-scale construction. Specifically, the safety risk control for China's metro construction mainly includes pre-construction risk identification and risk warning in construction. However, it is actually a “black box” in China. Based on Building Information Model (BIM) platform, this paper presents the Safety risk identification system (SRIS) and early warning system (SREWS) for China's metro construction. Methodologies including the modelling process, methods and key technologies for SRIS and SREWS are discussed in detail. The SRIS constructs risk identification knowledge database, designs retrieval matching algorithm and calculates the risk confidence level. The SREWS adopts data fusion, BIM and modern information technology to monitor the safety status. Discussions are drawn and the paper concludes by summarizing the main scientific contribution.