Considering the present situation and exisiting problems in IC card gas meter,based on the requirement and characteristics of gas charging,a non contact IC card prepayment intelligent gas meter was designed,taking low power MCU as a control core.The system offers the remote data communication function to solve the problem that the traditional prepayment gas meter has only the single function of IC card data transmission.To overcome the shortcoming of the present gas charging management,two forms of measurement were designed,including money measure and magnitude measure.The system principle was intriduced,the hardware and software were designed in accordance with the low power design principle and the data communication protocols were provided.The system has been applied in the practical products successfully.