A channel state information reference signal CSI-RS measurement feedback method, wherein the method comprises: receiving S channel state information reference signals CSI-RSs from a network device, wherein each CSI-RS corresponds to one antenna port number, and S is a positive integer; and sending M antenna port numbers that correspond to M CSI-RSs to the network device, and sending a precoding matrix indicator PMI that corresponds to a quantization result of a channel matrix H to the network device, wherein the channel matrix H corresponds to the M CSI-RSs, any row in the channel matrix H comprises M elements, S>M or S=M, and M is a positive integer; wherein the quantization result of the channel matrix H comprises a quantized value | H | of a modulus value of a quantization matrix H ' that corresponds to the channel matrix H, quantized values of phases ( φ 1,1,···, φ i,1,···, φ M,1) that respectively correspond to the M elements, and quantized values of transformation phases ( ψ M,1,···, ψ i,1,···, ψ 2,1) that respectively correspond to an M th element to the second element, so that the network device recovers H 1 according to the following formula: H 1 = H DG M 1 T ψ M, 1 ⋯ G i 1 T ψ i, 1 ⋯ G 21 T ψ 2,1 e 1, wherein H ′ = h 11,..., h i 1,..., h M 1 T = h 11 e jφ 1,1,..., h i 1 e jφ i, 1,..., h M 1 e jφ M, 1 T, a diagonal matrix D is: D = e jφ 1,1 ⋯ 0 ⋯ 0 0 ⋱ 0 ⋯ 0 ⋮ 0 e jφ i, 1 0 ⋮ ⋮ ⋮ 0 ⋱ 0 0 0 ⋯ 0 e jφ M, 1, a k th Givens rotation matrix is: G i 1 ψ i, 1 = 0 0 0 0 0 0 cos ψ i, 1 0 sin ψ i, 1 0 0 0 I i − 2 0 0 0 − sin ψ i, 1 0 cos ψ i, 1 0 0 0 0 0 0 i is a positive integer less than or equal to M, the transformation phases ( ψ M, 1, ···, ψ i,1,···, ψ 2,1) that respectively correspond to the M th element to the second element are obtained based on the channel matrix H and the diagonal matrix D, e 1 =[1, 0,..., 0] T, and I i-2 represents an identity matrix of (i-2)×(i-2). receiving S channel state information reference signals CSI-RSs from a network device, wherein each CSI-RS corresponds to one antenna port number, and S is a positive integer; and sending M antenna port numbers that correspond to M CSI-RSs to the network device, and sending a precoding matrix indicator PMI that corresponds to a quantization result of a channel matrix H to the network device, wherein the channel matrix H corresponds to the M CSI-RSs, any row in the channel matrix H comprises M elements, S>M or S=M, and M is a positive integer; wherein the quantization result of the channel matrix H comprises a quantized value | H | of a modulus value of a quantization matrix H ' that corresponds to the channel matrix H, quantized values of phases ( φ 1,1,···, φ i,1,···, φ M,1) that respectively correspond to the M elements, and quantized values of transformation phases ( ψ M,1,···, ψ i,1,···, ψ 2,1) that respectively correspond to an M th element to the second element, so that the network device recovers H 1 according to the following formula: H 1 = H DG M 1 T ψ M, 1 ⋯ G i 1 T ψ i, 1 ⋯ G 21 T ψ 2,1 e 1, wherein H ′ = h 11,..., h i 1,..., h M 1 T = h 11 e jφ 1,1,..., h i 1 e jφ i, 1,..., h M 1 e jφ M, 1 T, a diagonal matrix D is: D = e jφ 1,1 ⋯ 0 ⋯ 0 0 ⋱ 0 ⋯ 0 ⋮ 0 e jφ i, 1 0 ⋮ ⋮ ⋮ 0 ⋱ 0 0 0 ⋯ 0 e jφ M, 1, a k th Givens rotation matrix is: G i 1 ψ i, 1 = 0 0 0 0 0 0 cos ψ i, 1 0 sin ψ i, 1 0 0 0 I i − 2 0 0 0 − sin ψ i, 1 0 cos ψ i, 1 0 0 0 0 0 0 i is a positive integer less than or equal to M, the transformation phases ( ψ M, 1, ···, ψ i,1,···, ψ 2,1) that respectively correspond to the M th element to the second element are obtained based on the channel matrix H and the diagonal matrix D, e 1 =[1, 0,..., 0] T, and I i-2 represents an identity matrix of (i-2)×(i-2). a diagonal matrix D is: D = e jφ 1,1 ⋯ 0 ⋯ 0 0 ⋱ 0 ⋯ 0 ⋮ 0 e jφ i, 1 0 ⋮ ⋮ ⋮ 0 ⋱ 0 0 0 ⋯ 0 e jφ M, 1, a k th Givens rotation matrix is: G i 1 ψ i, 1 = 0 0 0 0 0 0 cos ψ i, 1 0 sin ψ i, 1 0 0 0 I i − 2 0 0 0 − sin ψ i, 1 0 cos ψ i, 1 0 0 0 0 0 0 i is a positive integer less than or equal to M, the transformation phases ( ψ M, 1, ···, ψ i,1,···, ψ 2,1) that respectively correspond to the M th element to the second element are obtained based on the channel matrix H and the diagonal matrix D, e 1 =[1, 0,..., 0] T, and I i-2 represents an identity matrix of (i-2)×(i-2).