A method for transmitting a channel state information-reference signal, CSI-RS, comprising: aggregating, by a base station, first configuration modes of K CSI-RSs included in a physical resource block, PRB, pair, to form a second configuration mode of the CSI-RSs, wherein K is an integer greater than or equal to 2, each of the first configuration modes is a configuration mode of X ports, a value of X is 2, 4, or 8, and the first configuration mode comprises a position of a resource element corresponding to each of the X ports; the second configuration mode is a configuration mode of X*K ports, and the second configuration mode comprises a position of a resource element corresponding to each of the X*K ports; and sending, by the base station, a CSI-RS to user equipment, UE, using the second configuration mode of the CSI-RSs; wherein the aggregating, by the base station, the first configuration modes of K CSI-RSs to form the second configuration mode of the CSI-RSs is performed in an aggregation manner of a frequency domain before a time domain comprising: obtaining in a PRB pair using a configuration mode of the X ports a resource element corresponding to a CSI-RS having an earliest time and lowest frequency, and aggregating the configuration modes of the X ports including the resource element; and if no CSI-RS exists at another frequency within said time, obtaining a CSI-RS within a next time adjacent to said time, and performing aggregation in ascending order of frequency. aggregating, by a base station, first configuration modes of K CSI-RSs included in a physical resource block, PRB, pair, to form a second configuration mode of the CSI-RSs, wherein K is an integer greater than or equal to 2, each of the first configuration modes is a configuration mode of X ports, a value of X is 2, 4, or 8, and the first configuration mode comprises a position of a resource element corresponding to each of the X ports; the second configuration mode is a configuration mode of X*K ports, and the second configuration mode comprises a position of a resource element corresponding to each of the X*K ports; and sending, by the base station, a CSI-RS to user equipment, UE, using the second configuration mode of the CSI-RSs; wherein the aggregating, by the base station, the first configuration modes of K CSI-RSs to form the second configuration mode of the CSI-RSs is performed in an aggregation manner of a frequency domain before a time domain comprising: obtaining in a PRB pair using a configuration mode of the X ports a resource element corresponding to a CSI-RS having an earliest time and lowest frequency, and aggregating the configuration modes of the X ports including the resource element; and if no CSI-RS exists at another frequency within said time, obtaining a CSI-RS within a next time adjacent to said time, and performing aggregation in ascending order of frequency. obtaining in a PRB pair using a configuration mode of the X ports a resource element corresponding to a CSI-RS having an earliest time and lowest frequency, and aggregating the configuration modes of the X ports including the resource element; and if no CSI-RS exists at another frequency within said time, obtaining a CSI-RS within a next time adjacent to said time, and performing aggregation in ascending order of frequency.