Disclosed is a method for receiving a downlink signal by a terminal in a wireless communication system from a base station. More particularly, a method for receiving a downlink signal comprises receiving, from a base station, information about a second reference signal being quasi co-located (QCL) and a first reference signal for demodulating a downlink signal; determining the quasi-continuity of the second reference signal on the basis of the average density of the second reference signal, which exists in a window, for determining a quasi-continuity; and receiving the downlink signal from the base station on the basis of the existence of the quasi-continuity of the second reference signal.