The present invention relates to a method and a device for allowing a terminal to perform decoding in a wireless communication system. According to the present invention, provided are a method and a device for receiving, from a base station through DMRS symbols, a first demodulation reference signal (DMRS) and a second DMRS, which are set according to specific patterns, wherein: each of the first DMRS and the second DMRS is transmitted on a specific antenna port and is located on the same time axis symbol as at least one different DMRS transmitted on the other antenna port; a location of the time axis symbol of the second DMRS is determined according to a service type of transmitted data; and the data are decoded by using the first DMRS and/or the second DMRS.