Abstract: In order to improve the evacuation efficiency of the teaching building, reduce the risk of fire injury, this paper carries out modeling and fire simulation based on Pyrosim and FDS. Available Safety Egress Time is determined by analyzing the influence of temperature, toxic and harmful gases, visibility, etc. Required Safe Egress Time is also determined through evacuation simulation based on Pathfinder. The congestion during the evacuation is analyzed. By improving the evacuation situation, including the open state, number, width of egresses, and evacuation route, the simulations are conducted again, and the results are processed by Origin and compared, and discussed according to the judgment criteria of safe evacuation. The results show that opening all exits can avoid large casualties, but cannot ensure safety evacuation; for the multi-storey teaching building with long corridor, the pedestrian congestion concentrate in the corridor and stairs rather than the exit, adding an outlet in the right place is more efficient than widen egress; planning reasonable evacuation route can significantly relieve the evacuation pressure of the corridor upper floors and two measures working together can fully ensure safety evacuation.

Key words: fire protection, fire smoke, evacuation, simulation