A Channel State Information, CSI, acquisition method, comprising: determining beamforming array information in a first dimension (Step 201); beamforming a pilot signal to be used for measurements in a second dimension in accordance with the beamforming array information in the first dimension, and transmitting the beamformed pilot signal to be used for the measurements in the second dimension to a User Equipment, UE, through a pilot resource in the second dimension (Step 202); and receiving, from the UE, CSI in the second dimension obtained by the UE by measuring the beamformed pilot signal used for the measurements in the second dimension (Step 203); wherein the determining the beamforming array information in the first dimension (Step 201) comprises: pre-configuring a pilot resource in the first dimension for the UE and notifying the UE of the pilot resource in the first dimension; transmitting a pilot signal in the first dimension to the UE through the pilot resource in the first dimension; and receiving, from the UE, CSI in the first dimension obtained by the UE by measuring the pilot signal in the first dimension through the pilot resource in the first dimension, and taking the CSI in the first dimension as the beamforming array information in the first dimension; wherein the beamforming the pilot signal to be used for the measurements in the second dimension in accordance with the beamforming array information in the first dimension further comprises: processing the CSI in the first dimension and beamforming the pilot signal to be used for the measurements in the second dimension in accordance with the processed CSI in the first dimension; wherein the CSI in the first dimension comprises Precoding Matrix Indicator, PMI, information and Channel Quality Indicator, CQI, information obtained by the UE in accordance with the PMI information, characterised in that the CSI in the first dimension further comprises Rank Indicator, RI, information corresponding to the PMI information. determining beamforming array information in a first dimension (Step 201); beamforming a pilot signal to be used for measurements in a second dimension in accordance with the beamforming array information in the first dimension, and transmitting the beamformed pilot signal to be used for the measurements in the second dimension to a User Equipment, UE, through a pilot resource in the second dimension (Step 202); and receiving, from the UE, CSI in the second dimension obtained by the UE by measuring the beamformed pilot signal used for the measurements in the second dimension (Step 203); wherein the determining the beamforming array information in the first dimension (Step 201) comprises: pre-configuring a pilot resource in the first dimension for the UE and notifying the UE of the pilot resource in the first dimension; transmitting a pilot signal in the first dimension to the UE through the pilot resource in the first dimension; and receiving, from the UE, CSI in the first dimension obtained by the UE by measuring the pilot signal in the first dimension through the pilot resource in the first dimension, and taking the CSI in the first dimension as the beamforming array information in the first dimension; pre-configuring a pilot resource in the first dimension for the UE and notifying the UE of the pilot resource in the first dimension; transmitting a pilot signal in the first dimension to the UE through the pilot resource in the first dimension; and receiving, from the UE, CSI in the first dimension obtained by the UE by measuring the pilot signal in the first dimension through the pilot resource in the first dimension, and taking the CSI in the first dimension as the beamforming array information in the first dimension; wherein the beamforming the pilot signal to be used for the measurements in the second dimension in accordance with the beamforming array information in the first dimension further comprises: processing the CSI in the first dimension and beamforming the pilot signal to be used for the measurements in the second dimension in accordance with the processed CSI in the first dimension; wherein the CSI in the first dimension comprises Precoding Matrix Indicator, PMI, information and Channel Quality Indicator, CQI, information obtained by the UE in accordance with the PMI information, characterised in that the CSI in the first dimension further comprises Rank Indicator, RI, information corresponding to the PMI information. processing the CSI in the first dimension and beamforming the pilot signal to be used for the measurements in the second dimension in accordance with the processed CSI in the first dimension; wherein the CSI in the first dimension comprises Precoding Matrix Indicator, PMI, information and Channel Quality Indicator, CQI, information obtained by the UE in accordance with the PMI information, characterised in that the CSI in the first dimension further comprises Rank Indicator, RI, information corresponding to the PMI information.