A quick charging method applied in a mobile terminal, the mobile terminal being coupled to a power adapter via a universal serial bus, USB, interface, power lines of the USB interface being used for charging a battery of the mobile terminal, data lines of the USB interface being used for communication between the mobile terminal and the power adapter, the mobile terminal supporting a normal charging mode and a quick charging mode, a charging speed of the quick charging mode being greater than that of the normal charging mode, the method comprising: determining, by the mobile terminal, a type of the power adapter when it is detected that the power adapter is coupled to the mobile terminal; activating, by the mobile terminal, a quick charging communication process between the mobile terminal and the power adapter when it is determined that the power adapter is not a computer, and transmitting, by the mobile terminal, a first instruction to the power adapter, wherein the first instruction requests the power adapter to charge the battery in the quick charging mode; communicating, by the mobile terminal, with the power adapter to determine a charging voltage of the quick charging mode; and communicating, by the mobile terminal, with the power adapter to determine a charging current of the quick charging mode; characterised in that the method further comprises: communicating, by the mobile terminal, with the power adapter to constantly transmit information of a current voltage of the battery to the power adapter after the power adapter adjusts an output voltage and output current of the power adapter to be the charging voltage and the charging current of the quick charging mode respectively and enters a constant current phase, so as to cause the power adapter to adjust the output current according to the current voltage of the battery, and charge the battery in a multi-stage constant current mode, wherein, in the multi-stage constant current mode, the output current of the power adapter is adjusted periodically. determining, by the mobile terminal, a type of the power adapter when it is detected that the power adapter is coupled to the mobile terminal; activating, by the mobile terminal, a quick charging communication process between the mobile terminal and the power adapter when it is determined that the power adapter is not a computer, and transmitting, by the mobile terminal, a first instruction to the power adapter, wherein the first instruction requests the power adapter to charge the battery in the quick charging mode; communicating, by the mobile terminal, with the power adapter to determine a charging voltage of the quick charging mode; and communicating, by the mobile terminal, with the power adapter to determine a charging current of the quick charging mode; characterised in that the method further comprises: communicating, by the mobile terminal, with the power adapter to constantly transmit information of a current voltage of the battery to the power adapter after the power adapter adjusts an output voltage and output current of the power adapter to be the charging voltage and the charging current of the quick charging mode respectively and enters a constant current phase, so as to cause the power adapter to adjust the output current according to the current voltage of the battery, and charge the battery in a multi-stage constant current mode, wherein, in the multi-stage constant current mode, the output current of the power adapter is adjusted periodically. communicating, by the mobile terminal, with the power adapter to constantly transmit information of a current voltage of the battery to the power adapter after the power adapter adjusts an output voltage and output current of the power adapter to be the charging voltage and the charging current of the quick charging mode respectively and enters a constant current phase, so as to cause the power adapter to adjust the output current according to the current voltage of the battery, and charge the battery in a multi-stage constant current mode, wherein, in the multi-stage constant current mode, the output current of the power adapter is adjusted periodically.