A system for controlling power amplification of a network equipment, the system comprising a main control unit and a power amplifier, wherein the main control unit comprises an information input port, wherein the power amplifier comprises a voltage control unit and a power amplifier transistor; the main control unit is configured to receive information related to the network equipment through the information input port, determine the state of the network equipment, apply a bias voltage control signal to the power amplifier according to the state of the network equipment, wherein the state comprises an idle state and a busy state, wherein the idle state indicates that the network equipment is in an idle timeslot and the busy state indicates that the network equipment is in a non-idle timeslot; when the network equipment is in the idle timeslot, the bias voltage control signal enables the power amplifier to switch off and not output a radio frequency, RF, signal, when the network equipment is in the non-idle timeslot, the bias voltage control signal enables the power amplifier to switch on and output an RF signal; wherein the power amplifier is configured to respond to the voltage control signal, and apply a voltage to a grid electrode or a base electrode of the power amplifier to switch on or switch off, wherein the voltage control unit is configured to respond to the bias voltage control signal, and apply the voltage to a grid electrode or a base electrode of the power amplifier transistor to switch on or switch off the power amplifier transistor, wherein the information includes signaling, service information, external control signal and internal clock signal, wherein the external control signal comprises a fault alarm signal or a signal for forcedly turning off the power amplifier, and wherein the internal clock signal indicates an internal clock of the network equipment; and wherein the main control unit is configured to determine the state of the network equipment according to the signalling and wherein the external control signals are set to the highest priority, and thus, when a fault alarm signal or a signal for forcedly turning off the transmitter or power amplifier is received, even if the network equipment is in non-idle timeslots as indicated by the signaling, the main control unit still determines the state of the network equipment as idle according to the priority. when the network equipment is in the idle timeslot, the bias voltage control signal enables the power amplifier to switch off and not output a radio frequency, RF, signal, when the network equipment is in the non-idle timeslot, the bias voltage control signal enables the power amplifier to switch on and output an RF signal; wherein the power amplifier is configured to respond to the voltage control signal, and apply a voltage to a grid electrode or a base electrode of the power amplifier to switch on or switch off, wherein the voltage control unit is configured to respond to the bias voltage control signal, and apply the voltage to a grid electrode or a base electrode of the power amplifier transistor to switch on or switch off the power amplifier transistor, wherein the information includes signaling, service information, external control signal and internal clock signal, wherein the external control signal comprises a fault alarm signal or a signal for forcedly turning off the power amplifier, and wherein the internal clock signal indicates an internal clock of the network equipment; and wherein the main control unit is configured to determine the state of the network equipment according to the signalling and wherein the external control signals are set to the highest priority, and thus, when a fault alarm signal or a signal for forcedly turning off the transmitter or power amplifier is received, even if the network equipment is in non-idle timeslots as indicated by the signaling, the main control unit still determines the state of the network equipment as idle according to the priority.