A method for receiving a CSI-RS by a terminal in a wireless communication system according to an aspect of the present invention may comprise the steps of: receiving, from a base station, CSI-RS configuration information about a CSI-RS configuration to which the CSI-RS is mapped, wherein the CSI-RS configuration corresponds to merging of a plurality of legacy CSI-RS configurations, and the plurality of legacy CSI-RS configurations are mapped to a plurality of antenna ports numbered by corresponding legacy CSI-RS port numbers; and receiving the CSI-RS from the base station through the plurality of antenna ports on the basis of the CSI-RS configuration information.