Anti-pinching fault with no obstacles occurred frequently to the door when Dongguan rail transit line 2 initially opened, which had a bad influence on the service quality of passengers. By comparing and investigating the structure of door drive, the causes of automatic anti-clamping fault were analyzed. Based on the environmental air pressure, structural design and software parameters of door, some improvement strategies were put forward, such as optimization of air pressure, adjustment of mechanical dimensions and configuration of software parameters. Practice proved that the measures adopted were reasonable and effective, and the anti-pinching fault was basically solved.