Projection system and method installed on subway station door

The invention discloses a projection system and method installed on a subway station door. The projection system comprises a rear cover plate, a front cover plate, an indicator light, a controller, aloudspeaker, a subway door, a lower cover plate and a projection lamp; the indicator light, the loudspeaker and the projection lamp are electrically connected with the controller; the indicator lightis installed outside the front cover plate and used for flickering to remind passengers to pay attention to the arrival of a train; the controller is installed inside the rear cover plate and used fordetecting a running signal of the train and controlling projection of projection information and playing of audios; the loudspeaker is installed outside the front cover plate and used for playing theaudios; the projection lamp is installed outside the lower cover plate and used for projecting the projection information onto a projection area; the subway door is used for isolating the passengersfrom a subway track. By means