Communication method and system for NFC device

The invention discloses a communication method and system for an NFC device, which are used for solving a problem that data is easily lost due to an unstable connection between an initiating device and a target device in a communication process of the existing NFC device. The method comprises the following steps of acquiring a first signal connected to a request transmitted by the initiating device; judging whether to be connected to the initiating device, and if yes, returning a second signal which is agreed to be connected at the transmission speed of the initiating device; and judging whether the initiating device confirms to receive the second signal or not, and if not, extending the second signal to the beginning of the next transmission period. According to the method and the system,the target device extends signal transmission time under a condition of periodic transmission of the initiating device, so that the connection between the initiating device and the target device canbe stably established, and