The present invention relates to a method for transmitting a frame, which is performed by a transmission station in a wireless LAN system that supports frame transmission and reception on the basis of a first physical layer and a second physical layer. The method comprises the steps of: transmitting a request-to-send (RTS) to a reception station through the first physical layer of the transmission station; receiving, by the reception station, a first clear-to-send (CTS) frame transmitted through the first physical layer of the reception station in response to the RTS frame; and transmitting a second CTS frame through the second physical layer of the transmission station, then transmitting a data frame through the first physical layer of the transmission station.