A matching method, wherein the method is applied to a remote electrical tilt antenna system; characterized in that the remote electrical tilt antenna system comprises multiple antenna radio frequency ports , a signal generator , and multiple remote electrical tilt units , and a signal coupling unit which is disposed in each antenna radio frequency port, wherein the signal generator is connected to each signal coupling unit, and wherein any two of the signal generator, one of the remote electrical tilt units and a base station remain in a communication connection with each other by using an AISG interface; and the method comprising: selecting , by the base station, one of the remote electrical tilt units and sending instruction information to the signal generator, wherein the instruction information is used to instruct the signal generator to connect to an antenna radio frequency port corresponding to the remote electrical tilt unit by using a multi-way gating switch and enable the signal generator to generate a signal; receiving , by the base station, the signal when the signal reaches the antenna radio frequency port through the signal coupling unit and is sent by using the antenna radio frequency port; and selecting , by the base station, a target sector according to a background noise value of each base-station radio frequency port of multiple base-station radio frequency ports; wherein the selecting, by the base station, a target sector according to a background noise value of each base-station radio frequency port comprises: sending, by the base station, a calculation instruction to a remote radio unit, RRU, wherein the calculation instruction is used to instruct the RRU to calculate a background noise value of a base-station radio frequency port corresponding to the RRU; and selecting, by the base station, an RRU corresponding to a base-station radio frequency port whose background noise value is increased as the target sector. selecting , by the base station, one of the remote electrical tilt units and sending instruction information to the signal generator, wherein the instruction information is used to instruct the signal generator to connect to an antenna radio frequency port corresponding to the remote electrical tilt unit by using a multi-way gating switch and enable the signal generator to generate a signal; receiving , by the base station, the signal when the signal reaches the antenna radio frequency port through the signal coupling unit and is sent by using the antenna radio frequency port; and selecting , by the base station, a target sector according to a background noise value of each base-station radio frequency port of multiple base-station radio frequency ports; wherein the selecting, by the base station, a target sector according to a background noise value of each base-station radio frequency port comprises: sending, by the base station, a calculation instruction to a remote radio unit, RRU, wherein the calculation instruction is used to instruct the RRU to calculate a background noise value of a base-station radio frequency port corresponding to the RRU; and selecting, by the base station, an RRU corresponding to a base-station radio frequency port whose background noise value is increased as the target sector. sending, by the base station, a calculation instruction to a remote radio unit, RRU, wherein the calculation instruction is used to instruct the RRU to calculate a background noise value of a base-station radio frequency port corresponding to the RRU; and selecting, by the base station, an RRU corresponding to a base-station radio frequency port whose background noise value is increased as the target sector. <EOS>