Disclosed in the present invention are an enhanced channel state information reference signal (CSI-RS) transmission method, a feedback information sending method and apparatus, and a device and a medium, which are used for solving the problems of the sending power of a network side and the feedback overhead of a terminal side being relatively high when the number of beams to be sent is less than the total number of configured CSI-RS antenna ports. In the embodiments of the present disclosure, when the number P of beams to be sent is less than the total number Ptot of configured CSI-RS antenna ports, a network side can select, from the configured Ptot CSI-RS antenna ports, some CSI-RS antenna ports for sending a beamforming CSI-RS to a terminal side.