The invention provides a CSI-RS measurement feedback method and device to optimize an analog pre-code and a digital pre-code. The method includes steps: a terminal device receives S CSI-
RSs transmitted by a network device, wherein each CSI-RS corresponds to one antenna port number; and the terminal device transmits M antenna port numbers corresponding to M CSI-
RSs to the network device and transmits a PMI corresponding to a channel matrix H and a quantification result of the channel matrix H to the network device. Therefore, the terminal device selects and feeds back M antenna port numbers corresponding to the M CSI-
RSs to a
base station through the S antenna port numbers corresponding to the S SCI-RSs, the network device can be assisted to select a weight of the analog pre-code, the PMI corresponding to the channel matrix H or the quantification result corresponding to the channel matrix H is transmitted to the network device, and optimization of the digital pre-code is realized.