A Doherty power amplifying circuit, is characterized by: the Doherty power amplifying circuit is a 3-way Doherty power amplifying circuit, and comprises two asymmetrical two-branch power devices (T1, T2): a first asymmetrical two-branch power device and a second asymmetrical two-branch power device, wherein the first asymmetrical two-branch power device comprises a first power amplifier and a second power amplifier, and the second asymmetrical two-branch power device comprises a third power amplifier and a fourth power amplifier; and wherein each of the second and the fourth power amplifiers (P1, P2) separately forms a peak power amplifier (P1, P2) of the Doherty power amplifying circuit, and the first and the third power amplifiers (C1, C2) are combined and serve as a main power amplifier (C1+C2) of the Doherty power amplifying circuit, wherein a gate bias voltage of the first power amplifier is the same as that of the third power amplifier; wherein a gate bias voltage of the second power amplifier is set lower than a gate bias voltage of any of the first and the third power amplifiers (C1, C2), and a gate bias voltage of the fourth power amplifier is set lower than the gate bias voltage of the second power amplifier; wherein if an output power back-off is more than 12 dB, the main power amplifier (C1+C2) is adapted to work and both of the peak amplifiers (P1, P2) in the two asymmetrical two-branch power device (T1, T2) are not turned on; if the output power back-off is less than 12 dB and greater than 6 dB, the main power amplifier (C1+C2) and the second power amplifier are adapted to work, and the fourth power amplifier in the second asymmetrical two-branch power device is not turned on; and if the output power back-off is less than 6 dB, the fourth power amplifier in the second asymmetrical two-branch power device is also adapted to work, and the main power amplifier (C1+C2) and the second and the fourth amplifiers (P1, P2) are adapted to work; wherein the first and the third power amplifiers (C1, C2) of the main power amplifier (C1+C2) have an equal first maximum output power; and the second and the fourth power amplifiers being configured as the peak power amplifier (P1, P2) have an equal second maximum output power; wherein the second maximum output power = 2*M*the first maximum output power, wherein M is a positive number, being selected between one or two on the basis of a peak-to-average power ratio of an input signal of the Doherty power amplifying circuit. the Doherty power amplifying circuit is a 3-way Doherty power amplifying circuit, and comprises two asymmetrical two-branch power devices (T1, T2): a first asymmetrical two-branch power device and a second asymmetrical two-branch power device, wherein the first asymmetrical two-branch power device comprises a first power amplifier and a second power amplifier, and the second asymmetrical two-branch power device comprises a third power amplifier and a fourth power amplifier; and wherein each of the second and the fourth power amplifiers (P1, P2) separately forms a peak power amplifier (P1, P2) of the Doherty power amplifying circuit, and the first and the third power amplifiers (C1, C2) are combined and serve as a main power amplifier (C1+C2) of the Doherty power amplifying circuit, wherein a gate bias voltage of the first power amplifier is the same as that of the third power amplifier; wherein a gate bias voltage of the second power amplifier is set lower than a gate bias voltage of any of the first and the third power amplifiers (C1, C2), and a gate bias voltage of the fourth power amplifier is set lower than the gate bias voltage of the second power amplifier; wherein if an output power back-off is more than 12 dB, the main power amplifier (C1+C2) is adapted to work and both of the peak amplifiers (P1, P2) in the two asymmetrical two-branch power device (T1, T2) are not turned on; if the output power back-off is less than 12 dB and greater than 6 dB, the main power amplifier (C1+C2) and the second power amplifier are adapted to work, and the fourth power amplifier in the second asymmetrical two-branch power device is not turned on; and if the output power back-off is less than 6 dB, the fourth power amplifier in the second asymmetrical two-branch power device is also adapted to work, and the main power amplifier (C1+C2) and the second and the fourth amplifiers (P1, P2) are adapted to work; wherein the first and the third power amplifiers (C1, C2) of the main power amplifier (C1+C2) have an equal first maximum output power; and the second and the fourth power amplifiers being configured as the peak power amplifier (P1, P2) have an equal second maximum output power; wherein the second maximum output power = 2*M*the first maximum output power, wherein M is a positive number, being selected between one or two on the basis of a peak-to-average power ratio of an input signal of the Doherty power amplifying circuit. the second and the fourth power amplifiers being configured as the peak power amplifier (P1, P2) have an equal second maximum output power; wherein the second maximum output power = 2*M*the first maximum output power, wherein M is a positive number, being selected between one or two on the basis of a peak-to-average power ratio of an input signal of the Doherty power amplifying circuit.