To understand the effectiveness of smoke-preventing air curtain

this paper used the professional software Fire Dynamics Simulation（FDS）to simulate the smoke movement process with the second floor of High Building Fire Test Tower in Sichuan Fire Research Institute of MPS as a prototype.The changing law of temperature and the smoke chemical component’s concentration（CO）in different monitoring pots of the atria were observed during the simulation.The results show that the temperature is changing be- tween 35～45℃

and the ultimate concentration of CO reaches to 1.8×10

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in the phase of stable burning above the height 1.25 m in the atria without smoke-preventing air curtains.And after installation of the smoke-preventing air curtains

the temperature is changing between 20～30℃

and the ultimate concentra- tion of CO reaches to 7.57×10

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in the same monitoring pots.Therefore

it indicates that the smoke-pre- venting air curtain can effectively reduce the quantity of smoke

lower the temperature of smoke

and di- lute the concentration of toxic gases in smoke.