The invention provides a mobile station which comprises an awakening rule module, a communication module and a mode switching module, wherein the awakening rule module generates an awakening rule; the communication module sends the awakening rule and receives an awakening signal conforming to the awakening rule to enter a moving mode so as to receive a data packet; when the mode switching module does not receive the data packet within the preset time, the mode switching module is switched into an electricity-saving mode; when the awakening signal is received, the electricity-saving mode is switched to the moving mode; and the communication module is also used for notifying an access point of the working mode switching. The invention also provides an access point and a method of saving electricity for the mobile station. In the mobile station, the access point and the method of saving the electricity for the mobile station, the awakening rule is set to cause the mobile station to enter the electricity-saving mode when no data packets exist; and when the data packet exists, the mobile station receives the awakening signal to enter the moving mode so as to receive the data packet. Therefore, the mobile station does not need to be awakened periodically, more electricity is saved, and the transmission of the data packet is not delayed.