Due to the special nature of the fire at subway station, the traditional fire simulation and fire drills are difficult to carry out. It is difficult to obtain accurate data of fire, and emergency program design is also difficult to achieve the greatest degree of optimization. This paper discusses the advantage of virtual roaming technology, builds the model of subway station by 3Dmax. By webmax virtual roaming we can build the virtual tour system of subway station fire emergency, which provides the user with a fire simulation environment of metro station. At the same time, we also introduce the corresponding key technologies and the overall program system which we have designed. More methods for optimizing the fire emergency plan also have been provided.