Abstract: The personnel evacuation evaluation index of available safe evacuation time was proposed for evaluating the risk of a fire and a full-size fire simulation model for the first three compartments of the B-type train in Guangzhou Metro Line 3 was established with the fire smoke simulation software FDS and the smoke spread characteristics of the simulation results were analyzed. Three typical types of fire sources in train compartments are set according to the principle of single variable. The simulations under the three typical fire conditions were performed and their smoke spread characteristics were analyzed and compared to calculate the available safe evacuation time. The simulation results show that the combustion of fire sources in different areas has a certain effect on the smoke spread characteristics of stationary subway train compartments and the risk of the fire in the middle of a compartment is greater than that of the fire at the ends of a compartment in the condition of same power fire source.