Abstract: Based on the Shenyang subway project, a numerical simulation of kerosene fire/smoke spread over the subway station platform was performed by the software CFD and SIMPLE algorithm for fluid mechanics, including 5 different types of smoke exhaust systems. The centers of two stairway openings on the plane 2 m above platform floor were taken as test points where the time-dependent relationship between temperature and CO2 mole fraction and the cloud charts of fire scene temperature and CO2 concentration fields were obtained to analyze how the different ways to exhaust smoke affect the spread of fire/smoke at subway station platform. The results showed that when the mechanical smoke exhauster is used solely, the position difference of exhauster outlets affects unobviously the fire/smoke control effectiveness. But, the exhauster in combination with forced draft system can inhibit more efficiently the spread of fire/smoke though periodical attenuation is found during the inhibition. The stairway farther from the fire center is proved the safer exit for human evacuation.