Abstract: This paper takes a teaching building of a university as the research object, on the basis of on-site observation data, uses PyroSim and Pathfinder software to carry out numerical simulation of fire, to study the influence of the change rule of smoke visibility and ambient temperature at the exit of the teaching building on the evacuation of the personnel, and to make a safety judgement according to the evacuation result, and based on the principle of system dynamics, puts forward a reasonable SD safety countermeasure model. The research results show that optimizing the necessary safety exits can effectively improve the evacuation efficiency, and the total evacuation time is shortened by 132.5 s; Adding the necessary automatic sprinkler system and mechanical smoke exhaust system, 300 s after the fire occurs, the exit temperature is reduced, and the smoke visibility is increased by about 20 m, which can greatly improve the escape safety of the exit.

Key words: university teaching building, numerical simulation of fire, PyroSim, Pathfinder, evacuation