In a bid to evaluate the train wind pressure on platform screen door installed on the platform of the subway station, the field test was conducted in existing Seoul Metropolitan Subway Line 2 in operation now. Variations in wind pressure on platform screen door, which were caused by the running train were measured depending on four different train operation patterns. The highest pressure of 28.1 kgf/$m^2$ was indicated on platform screen doors while two trains were passing the platform in different directions at a speed of 60 km/h.