A system for displaying an electric quantity of a bluetooth earphone on a portable electronic equipment, comprising: a bluetooth earphone comprising: a first communication module; a power management module for computing a current electric quantity value of the bluetooth earphone and converting the electric quantity value into an electric quantity parameter; and a control module for receiving the electric quantity parameter from the power management module and transmitting the electric quantity parameter to the first communication module; and a portable electronic equipment comprising: a second communication module, a processing module; and a display module; characterised in that, the second communication module is adapted to receive the electric quantity parameter transmitted by the first communication module via a bluetooth transmission protocol, the processing module is adapted to receive the electric quantity parameter transmitted by the second communication module and to convert the electric quantity parameter into an electric quantity value, and the display module is adapted to receive the electric quantity value from the processing module and to display it in form of an icon, wherein, the control module is adapted to control the first communication module to transmit an electric quantity enabling command, the electric quantity enabling command being a command of the bluetooth earphone for requesting the portable electronic equipment to enable an electric-quantity display function, and an electric quantity transmitting command containing the electric quantity parameter to the second communication module at the same time, wherein, the bluetooth earphone is adapted to transmit an electric quantity enabling command to the electronic equipment a first time when the electronic equipment and the bluetooth earphone are connected, and wherein the bluetooth earphone is adapted to transmit the electric quantity transmitting command when it transmits the electric quantity enabling command again. a bluetooth earphone comprising: a first communication module; a power management module for computing a current electric quantity value of the bluetooth earphone and converting the electric quantity value into an electric quantity parameter; and a control module for receiving the electric quantity parameter from the power management module and transmitting the electric quantity parameter to the first communication module; and a first communication module; a power management module for computing a current electric quantity value of the bluetooth earphone and converting the electric quantity value into an electric quantity parameter; and a control module for receiving the electric quantity parameter from the power management module and transmitting the electric quantity parameter to the first communication module; and a portable electronic equipment comprising: a second communication module, a processing module; and a display module; a second communication module, a processing module; and a display module; characterised in that, the second communication module is adapted to receive the electric quantity parameter transmitted by the first communication module via a bluetooth transmission protocol, the processing module is adapted to receive the electric quantity parameter transmitted by the second communication module and to convert the electric quantity parameter into an electric quantity value, and the display module is adapted to receive the electric quantity value from the processing module and to display it in form of an icon, wherein, the control module is adapted to control the first communication module to transmit an electric quantity enabling command, the electric quantity enabling command being a command of the bluetooth earphone for requesting the portable electronic equipment to enable an electric-quantity display function, and an electric quantity transmitting command containing the electric quantity parameter to the second communication module at the same time, wherein, the bluetooth earphone is adapted to transmit an electric quantity enabling command to the electronic equipment a first time when the electronic equipment and the bluetooth earphone are connected, and wherein the bluetooth earphone is adapted to transmit the electric quantity transmitting command when it transmits the electric quantity enabling command again.