In this paper, evacuation of passengers on platforms with PSDsis studied by taking the subway system in Hong Kong as an example. Passenger flow is observed to be very high during peak hours.In the morning peak hours, 8-car trains with a capacity of 2500passengers would run at 2.1 min intervals. The loading is 70,000passengers per hour along one direction (Hong Kong MTR Homepage, 2009). High population density would give more challengesto the emergency management of the transport system, particularly under big fires. To study the effect of PSDs on emergencyevacuation, one of the most crowded stations in Hong Kong isselected. Passenger flow characteristics are surveyed first. Evacuation times under different passenger loadings from a train vehicleare then estimated from the compiled data. Several scenarios withdifferent opening conditions of PSD are assessed.