A method and apparatus for implementing dimming are disclosed. The method includes: at an MAC layer, dividing an MSDU into two or more sub-MSDUs with a same length; encapsulating each sub-MSDU obtained after dividing into a separate MPDU, and generating a compensation frame for each MPDU; and aggregating the MPDUs and the compensation frames with the same addresses into a PSDU part of a PPDU and transmitting a physical frame.