A carrier channel control method comprising: applying, by an air conditioning control module in an air conditioning unit, an air conditioner control signal to a power line carrier to obtain a power line communication, PLC, signal, wherein the power line carrier comprises a plurality of communication subcarriers; monitoring, by a noise monitoring module in the air conditioning unit, PLC noise values respectively corresponding to each of the communication subcarriers used to transmit the PLC signal, when the air conditioning unit is powered on and starts to work; for each of the communication subcarriers, generating, by the air conditioning control module , a noise power value corresponding to the communication subcarrier according to the corresponding PLC noise value, wherein each of the carrier channels respectively corresponds one of the communication subcarriers; determining, by the air conditioning control module , a minimum power value to transmit the PLC signal in a communication network where the communication subcarrier is located; determining, by the air conditioning control module , a superimposed power value of a frequency point of the communication subcarrier according to the minimum power value and the corresponding noise power value; judging, by the air conditioning control module , whether the superimposed power value is greater than an electronic magnetic compatibility, EMC, threshold corresponding to the frequency point; generating, by the air conditioning control module , the state data of the carrier channel according to the superimposed power value and the EMC threshold, in a case where the superimposed power value is greater than the EMC threshold corresponding to the frequency point; and controlling, by a communication module in the air conditioning unit, each of the carrier channels respectively according to the state data of each of the carrier channels. applying, by an air conditioning control module in an air conditioning unit, an air conditioner control signal to a power line carrier to obtain a power line communication, PLC, signal, wherein the power line carrier comprises a plurality of communication subcarriers; monitoring, by a noise monitoring module in the air conditioning unit, PLC noise values respectively corresponding to each of the communication subcarriers used to transmit the PLC signal, when the air conditioning unit is powered on and starts to work; for each of the communication subcarriers, generating, by the air conditioning control module , a noise power value corresponding to the communication subcarrier according to the corresponding PLC noise value, wherein each of the carrier channels respectively corresponds one of the communication subcarriers; determining, by the air conditioning control module , a minimum power value to transmit the PLC signal in a communication network where the communication subcarrier is located; determining, by the air conditioning control module , a superimposed power value of a frequency point of the communication subcarrier according to the minimum power value and the corresponding noise power value; judging, by the air conditioning control module , whether the superimposed power value is greater than an electronic magnetic compatibility, EMC, threshold corresponding to the frequency point; generating, by the air conditioning control module , the state data of the carrier channel according to the superimposed power value and the EMC threshold, in a case where the superimposed power value is greater than the EMC threshold corresponding to the frequency point; and controlling, by a communication module in the air conditioning unit, each of the carrier channels respectively according to the state data of each of the carrier channels. <EOS>