The present disclosure provides a method for feeding back a precoding matrix indicator, a receive end and a transmit end, where the method includes: selecting, by a receive end, a precoding matrix W from a codebook based on a reference signal, where W ∈ [ X 1 ⁡ ( θ 1 ) X 2 ⁡ ( θ 2 , φ n ) ] , the θ1 and the θ2 indicate a phase difference of weighted values for signal transmission between two neighboring antennas in a first antenna group of a transmit end and a phase difference of weighted values for signal transmission between two neighboring antennas in a second antenna group of the transmit end, the φn indicates a phase difference of weighted values for signal transmission between the first antenna group and the second antenna group, where the signal transmission between the first antenna group and the second antenna group is for a same transmission layer, φ n = ⅇ j ⁢ ⁢ 2 ⁢ π ⁢ ⁢ n M , and sending, by the receive end, a precoding matrix indicator PMI to the transmit end.