Provided are a method and device for configuring a slot formation indication (SFI) in a wireless communication system, particularly in new radio (NR) access technology. A user equipment (UE) receives, from a network, a first SFI for an unpaired carrier, configures a first slot in the unpaired carrier on the basis of the first SFI, receives, from the network, a second SFI for a supplemental uplink (SUL) carrier, and configures a second slot in the SUL carrier on the basis of the second SFI. The first SFI and the second SFI are separate pieces of information.