Abstract: This article compares the automatic fire extinguishing systems in the industry and proposes the advantages of using water mist fire extinguishing systems in urban rail transit vehicles. Through an example of installing a water mist fire extinguishing system in a domestic subway, the scheme of the water mist fire extinguishing system, system composition and configuration scheme of the water mist device are introduced. According to the requirements of local standards, through the analysis of environmental parameters during fire fighting, it was verified that the installed water mist fire extinguishing system met the design requirements and achieved the purpose of fire suppression and control.

Key words: subway, water mist fire extinguishing system, performance test, fire suppression performance