A method for harmonic channel detection is provided. The method comprises receiving, by a first AP working on a first channel, a beacon frame transmitted by a second AP and parsing the beacon frame to obtain information of a second channel indicated in the beacon frame. The method further comprises determining a plurality of candidate harmonic channels and validating that the second channel is one of the candidate harmonic channels. In addition, the method further comprises validating that the beacon frame is transmitted on the second channel based on a sequence number and a TBTT indicated in the beacon frame and discarding the beacon frame. Implementations of the present disclosure can reduce harmonic frames from being reported to a controller at upper layer, and improve the performance of the network.