A method for improving communication distance accuracy of a transaction system via temperature compensation includes: storing a reference temperature value and a reference field intensity value in a card read micro-controller (101), wherein a temperature sensor (104) is used for detecting an external ambient temperature; based on a difference between the detected external ambient temperature and the reference temperature value, determining at the card read micro-controller (101) whether to perform temperature compensation to an RF field intensity or an equivalent value of the RF field intensity of a SIM card antenna (203), wherein the RF field intensity and the equivalent value of the RF field intensity are received by a card read antenna (103) and are transmitted to the card read micro-controller through a card read RF module (102); transmitting a distance determination result via the card read RF module (102) to the card read antenna (103), which sends the result to an RF SIM card (200). This invention includes the following benefits: it can improve distance control accuracy of the transaction system under various external temperatures environment and reduce unconscious long-distance card-swiping mis-operation.