A method for transmitting, by a base station, a demodulation reference signal (DMRS) in a wireless communication system according to one embodiment of the present invention comprises the steps of generating a DMRS sequence; mapping the DMRS sequence to resource elements of respective layers; and transmitting, through respective antenna ports corresponding to the respective layers, the DMRS sequence mapped to the resource elements, wherein if the number of layers exceeds a predetermined number, the DMRS sequence is mapped to the resource elements according to a pattern on at least two bundled consecutive resource blocks.