The present specification presents a method for transmitting and receiving, by a station, a signal in a wireless LAN (WLAN) system supporting eight space time streams at most, and an apparatus therefor. More particularly, the present specification presents a method for transmitting and receiving a signal including a pilot sequence for 3-channel bonding or 4-channel bonding per each space time stream when a station transmits and receives a signal over a channel in which three or four channels are bonded, and an apparatus therefor.