With the increasing number of domestic buildings, the importance of safety evacuation in case of fire in the buildings has aroused public attention. Taking a certain public building as the research subject, the author of the thesis imports the 3D model processed by Revit software into such softwares as Pyrosim and Building Exodus by which the 3D model is converted into the fire model and the evacuation model, then conducts the analysis of safety evacuation via the evacuation software according to its detailed description of the fire. The analysis results are compared with the fire in time, and the building model is optimized in order to achieve the safety requirements.The appliance of the BIM model into the practice of safety evacuation in buildings is considered as the manifestation of the data-orientation and visualization of the BIM model, and it would provide the future practice of evacuation with significant guidance