Abstract: The invention discloses a method and system for purchasing a transaction ticket by using a transaction card. A transaction card device transmits a ticket purchasing request including transportation information and transaction card information to an acquiring bank server. The acquiring bank server generates a ticket ordering request according to the transportation information so as to process a reservation procedure with a ticketing system, and then transmits a card authorization request generated according to the transaction card information of the ticket purchasing request and the price of a ticket ordering response to the issuing bank server. After the issuing bank server checks corresponding transaction card information and approves the request, a card authorization response is returned to the acquiring bank server. Then, the acquiring bank server generates a ticket purchase response to the transaction card device for outputting transportation ticket information and a bill.