Railway key passenger service method and system and railway unimpeded code service system

The invention discloses a railway key passenger service method, which comprises the following steps: a pre-marking step: a train service personnel binds and marks seat information of key passengers and railway unimpeded codes by adopting station train interaction terminal equipment, and synchronizes the seat information and the railway unimpeded codes to a background of a railway unimpeded code service system; a key passenger service reservation step: key passengers identify railway unimpeded codes arranged at carriage seats through terminal equipment, activate and start a railway unimpeded code service system, and fill in and submit key passenger service applications on line through the unimpeded code service system; and a key passenger service application acceptance step: the background of the unimpeded code service system pushes the key passenger service application to the station-bus interaction terminal equipment, and the station-bus interaction terminal equipment sends a key passenger service acceptance