According to one embodiment of the present invention, a method of transmitting uplink, which is transmitted by a terminal in a wireless communication system, includes receiving a first control signal indicating a shortened transmission time interval (sTTI) or a symbol at which a common reference signal for demodulating data transmitted for a plurality of sTTIs is transmitted, receiving a second control signal including information indicating the plurality of sTTIs at which the data is transmitted, and transmitting the common reference signal at the indicated sTTI or symbol and transmitting the data for the plurality of the sTTIs according to first control signal and the second control signal. In this case, the information indicating the plurality of the sTTIs may include an interval of a sTTI unit or a symbol unit between the sTTI or symbol position at which the common reference signal is transmitted and the plurality of sTTIs.