Abstract: A NFC payment module and controlling method are provided. The NFC payment module is embedded in a smart device and includes an encapsulation shell, a micro controller, a radio-frequency chip, an antenna, and a security chip. The phase detection and the power amplification can be performed by the radio-frequency chip with the antenna, which is commanded by the smart device. Therefore, the modulation phase angle is adjusting until the modulation phase angel is equal to the specific phase angle of the transaction signal.