In this research, to establish the emission for the people who are clearing out, through the numerical analysis using the CFD model, the dangerousness has been investigated in the various emission conditions in a station platform. In addition, we have measured the flowing state of smoke through the visualization measurements as a consequence of safety evaluation of subway station-platform and tunnels under the fire scenario by using numerical analysis with the simulation of subway platform fire, and through the analysis of the cases whether smoke exhaustion is available or not we figured out that smoke exhaustion case results safer condition for passenger evacuation showing lower mean density of smoke and average temperature, comparing to the case in which smoke exhaustion is not available. Moreover, when the capacity of emission and the space of platform is set up, the design regards the properties of the fire emission.