A train passenger information system coupling and decoupling method

The invention discloses a train passenger information system coupling and decoupling method, and relates to the field of an embedded computer. The method is implemented by three threads which are respectively an MVB network coupling and decoupling thread, an 8 network segment Ethernet coupling and decoupling thread and an 8 network segment IP maintaining thread. The MVB network coupling and decoupling thread amends an MVB coupling address of the device, ensuring no occurrence of MVB address conflicting between two trains in coupling. The 8 network segment Ethernet coupling and decoupling thread implements changing a segment where the 8 network segment IP address locates over the change of the MVB coupling address, ensuring no occurrence of 8 network segment device IP address conflicting between two trains in coupling. The 8 network segment IP maintaining thread ensures IP address of the 8 network segment device IP address correspond to the MVB network coupling state by circle detection on 8 network segment device IP address. The invention may satisfy coupling and decoupling of train passenger information after the train is physically recombined in the field of subway.