Abstract: The present invention discloses that a power saving method for Wi-Fi (wireless local area network; Wireless Fidelity) module comprising the following steps. An associating step is performed with at least one of a full speed mode and a deep sleep mode controlled by a power management system. A network connecting step is performed with a power saving mode controlled by the power management system when completed the associating step. An operating step is performed with at least one of the full speed mode and the power saving mode controlled by the power management system when completed the network connecting step. An authenticating step is performed with at least one of the full speed mode, the power saving mode and the deep sleep mode controlled by the power management system when completed the operating step.