Are all Tianjin subway station attendants dispatched?

Yes. According to the Tianjin Metro's official website, in order to meet the operational needs of the city's rail transit network, Tianjin Metro adopts the labor dispatch system for subway station attendants, so they are all dispatched. Tianjin's first subway line was officially put into operation on December 28, 1984, making Tianjin the second city in mainland China to open rail transit.