A method for selecting space division multiplexing users, comprising: acquiring a channel response of each of candidate users by performing a channel estimation on received data of each of the candidate users; constructing a channel response matrix of all the candidate users by using the channel response of each of the candidate users; and performing a rank-revealing quadrature rectangle (RRQR) decomposition of the channel response matrix, and determining, based on a result of the RRQR decomposition, at least two of the candidate users that are most linearly independent and satisfying a space division multiplexing user number required by a base station as the space division multiplexing users; characterized in that, wherein the step of performing a rank-revealing quadrature rectangle (RRQR) decomposition of the channel response matrix, and determining, based on a result of the RRQR decomposition, at least two of the candidate users that are most linearly independent and satisfying a space division multiplexing user number required by a base station as the space division multiplexing users comprises: obtaining a permutation matrix, a Q matrix and an R matrix through the RRQR decomposition of the channel response matrix, wherein the channel response matrix multiplied by the permutation matrix is equal to the Q matrix multiplied by the R matrix; determining, based on the permutation matrix, a plurality of the candidate users that are most linearly independent among all the candidate users; and selecting, according to a total number of space division multiplexing users required by the base station, at least two of the candidate users from the plurality of the candidate users that are most linearly independent as the space division multiplexing users. acquiring a channel response of each of candidate users by performing a channel estimation on received data of each of the candidate users; constructing a channel response matrix of all the candidate users by using the channel response of each of the candidate users; and performing a rank-revealing quadrature rectangle (RRQR) decomposition of the channel response matrix, and determining, based on a result of the RRQR decomposition, at least two of the candidate users that are most linearly independent and satisfying a space division multiplexing user number required by a base station as the space division multiplexing users; characterized in that, wherein the step of performing a rank-revealing quadrature rectangle (RRQR) decomposition of the channel response matrix, and determining, based on a result of the RRQR decomposition, at least two of the candidate users that are most linearly independent and satisfying a space division multiplexing user number required by a base station as the space division multiplexing users comprises: obtaining a permutation matrix, a Q matrix and an R matrix through the RRQR decomposition of the channel response matrix, wherein the channel response matrix multiplied by the permutation matrix is equal to the Q matrix multiplied by the R matrix; determining, based on the permutation matrix, a plurality of the candidate users that are most linearly independent among all the candidate users; and selecting, according to a total number of space division multiplexing users required by the base station, at least two of the candidate users from the plurality of the candidate users that are most linearly independent as the space division multiplexing users. obtaining a permutation matrix, a Q matrix and an R matrix through the RRQR decomposition of the channel response matrix, wherein the channel response matrix multiplied by the permutation matrix is equal to the Q matrix multiplied by the R matrix; determining, based on the permutation matrix, a plurality of the candidate users that are most linearly independent among all the candidate users; and selecting, according to a total number of space division multiplexing users required by the base station, at least two of the candidate users from the plurality of the candidate users that are most linearly independent as the space division multiplexing users.