The invention provides a telephone payment terminal trading method and a telephone payment terminal system. The telephone payment terminal trading method is characterized by: firstly, executing a first instruction, completing interaction between the terminal and an IC card and outputting trading request data; sending the trading request data to a telephone payment gateway, and after analyzing, sending to a POS server, wherein the POS server carries out trading processing and determines whether the trading is successful, if the trading is successful, returning an on-line data result and if the trading is not successful, ending the trading; executing second instruction and processing the on-line data result; according to a trading authentication result and a parameter set in the card, determining whether to reject the trading; if the trading is rejected, displaying error information and ending the trading, if the trading is accepted, sending trading result data to the telephone payment gateway, wherein the telephone payment gateway stores the trading result data sent by the terminal and returns trading slip data. By using the above mode, IC card trading can be realized on the telephone payment terminal.