Abstract: Taking the island type subway platform as the research object, the numerical model was established by FDS software. The influence of automatic sprinkler system on the smoke characteristics of luggage fire in the middle of subway platform was calculated by numerical simulation.The results showed that the smoke spread speed and smoke temperature at the subway\platform will be restrained when there is automatic sprinkler system. The automatic sprinkler system has little effect on theCO mass concentration and smoke visibility in the smoke. The CO mass concentration in the smoke increases near the fire source, and decreases away from the fire source. The visibility of the smoke decreases near the fire source, and increases away from the fire source.

Key words: automatic sprinkler system, subway, smoke characteristics, numerical simulation