A method and apparatus are provided. The method of configuring a sidelink transmission power by a V2X user equipment (UE) in a wireless communication system includes receiving, from a base station (BS), first parameter for sidelink link quality or second parameter for downlink link quality, configuring, the transmission power for at least one of a sidelink control channel or a sidelink data channel based on sidelink pathloss or downlink pathloss according to the receiving of the first parameter or the second parameter, and transmitting, to a receiving V2X UE, the sidelink control channel or the sidelink data channel based on the configured transmission power.