Disclosed herein is a method for transmitting a physical random access channel (PRACH) by a user equipment in a wireless communication system. In particular, the method includes receiving information about PRACH resource allocation, and transmitting, based on the information, the PRACH on any one of one or more PRACH occasions allocated in a PRACH slot, wherein a number of the one or more PRACH occasions is based on a preamble format and a starting Orthogonal Frequency Division Multiplexing (OFDM) symbol for the PRACH.