For the BAS in subways, electromechanical equipment including air conditioning ventilation system, water supply and drainage, lighting, elevator, escalator, guiding sign, etc. in the subway station and running tunnel are fully managed and controlled in operation by the distributed computer supervision and control system. During the fire or train jam, running mode against disasters will be rapidly and timely on. According to fire information sent by the fire alarm system or block information sent by the automatic train control system, air supply and exhaust will be automatically adjusted for ventilation and smoke discharge and personnel evacuation