Abstract: In order to prevent underground building fire accidents such as subway, BIM and Revit technology were applied to fire early warning and evacuation management of underground buildings, and the changes of smoke and evacuation process under different conditions were analyzed, so as to realize the early warning of subway fire and the construction of visual platform for evacuation. Taking an operating subway as an example, according to the fire smoke diffusion process, the important factors of personal safety caused by smoke height were determined, which was used as the index to evaluate the safe evacuation, and the available evacuation time at the minimum critical smoke height was obtained. The evacuation simulation was carried out by quantitative processing, and the actual evacuation time was compared with the available evacuation time. In order to meet the requirements of safe use, the evaluation and optimization of building model were carried out. The results showed that there are some hidden dangers in the layout of the existing evacuation passages. The evacuation time and potential safety hazards could be reduced by evacuating the unreasonable commercial box, increasing the open space area of the waiting public area, strengthening the density of sprinkler equipment, organizing the safety evacuation exercise and so on.

Key words: underground architecture, fire warning, evacuation channel, BIM