Abstract: In view of the shortcomings of the current emergency communication guarantee for fire rescue teams under extreme conditions such as public network paralysis and power interruption caused by major disasters and accidents in the subway, this paper puts forward countermeasures and suggestions for the emergency communication guarantee of the subway. At this stage, the hybrid networking of wired + wireless ad hoc network base stations is used, the standard specifications will be revised and improved in the future, the tunnel wireless signal coverage platform and special section telephone systems will be built in the tunnel by using the mode of "optical fiber repeater + antenna", the solutions are formulated, the extreme conditions such as "open circuit, power failure and network disconnection" are simulated, and the field tests and the whole process was organized in subway stations in different cities for many times. The feasibility of the solution is verified by the full element exercise.

Key words: extreme conditions, subway；emergency communication