Abstract: In view of various hazard sources and the difficult safety management of metro engineering when crossing the gas stratum, professional applications of automatic gas detection, realtime monitoring of shield tunneling and personnel positioning are integrated by using Internet of Things, streaming media and wireless transmission technology, an intensive control and management mode featuring whole line coverage, full participation and whole process management is proposed, in order to establish the safety prevention and control management system of metro gas tunnel under the supervision of all participants. The system has been successfully applied in the whole process of the Phase III construction of Chengdu rail transit Line 6. Through online and offline linkage management, the system can perform realtime monitoring, rapid response and timely disposal against the dangerous sources of the metro project crossing gas stratum at the civil construction stage, and effectively improve the level of safety risk management in the construction process, at the same time save the management cost.