The present disclosure provides a CSI measurement method and a CSI measurement device. The CSI measurement method includes steps of: receiving channel state measurement information from a network side, the channel state measurement information including a CRS from a set of CRS ports corresponding to vertical beams having an identical Vshift in a vertical dimension, the Vshift determines shift values of CRS patterns in different vertical beams in the vertical dimension in a frequency domain; and performing CSI measurement in accordance with the channel state measurement information. According to the embodiments of the present disclosure, the CSI measurement is performed in accordance with the CRS of the set of CRS ports corresponding to the vertical beams having an identical Vshift in the vertical dimension, so that a common signal/channel in the vertical dimension is covered by several vertical beams. Each vertical beam has a small main lobe width, so a constant modulus weight vector may be used. As a result, it is able to improve the power efficiency.