The development of virtual reality (VR) technology makes it possible for users to improve the understanding of dangerous scenes from computational simulations.A prototype system-AutoEscape based on the integration of virtual reality visualization and numerical simulation, was developed for human evacuation in fire scenarios.FDS was selected to simulate the fire growth and an evacuation computational engine was designed and implemented based on GIS technology.A VR representation module was constructed, which develops a comprehensive representation for the distributed scenario variables according to numerical results.The case study indicates that the system can help users to form a deep full-scale understanding of fire evacuations, and therefore provide a virtual training environment for emergency evacuation drills and fire rescue command.