Abstract: Taking the Gaishan Road Station of Fuzhou-Changle Airport Intercity Railway as example, during the train entering the tunnel from the opening of U-shaped cutting at speed of 100 km/h, the transient pressure change law of platform screen doors when the train passing overtaking station is researched. Research results show that the maximum positive pressure of the screen door appears as the front of the train passes them, and the maximum negative pressure appears as the rear of the train passes them. The maximum positive pressure generated by the train passing through the screen door gradually decreases from the entry side to the exit side. However, the change law of the maximum negative pressure is not obvious. The maximum positive pressure of the screen door is 346 Pa, and the maximum negative pressure is -365 Pa. In addition, when the train front and rear pass, the pressure on the screen door is unevenly distributed, while when the train body passes, the pressure on the screen door is evenly distributed.