A beam selection method, comprising: separately acquiring multipath information of each receive port of M receive ports of a base station, wherein the multipath information is used to indicate at least one path corresponding to each receive port, and M is a positive integer; performing multipath matching between the M receive ports according to the multipath information to determine i groups of matching paths, wherein i is a positive integer; characterized by separately determining at least one equivalent signal at N transmit ports of the base station according to at least one uplink signal on the i groups of matching paths, wherein N is a positive integer, comprising selecting j groups of matching paths from the i groups of matching paths according to energy on the i groups of matching paths, wherein j is a positive integer, and 1≤j≤i; and separately performing weighted processing on the uplink signals of the j groups of matching paths to separately determine j equivalent signals at each transmit port of the N transmit ports, which comprises: for the k th group of matching paths among the j groups of matching paths, performing weighted processing on at least one uplink signal of the k th group of matching paths according to the following equation, so as to determine the k th equivalent signal z n,k at the n th transmit port of the N transmit ports: z n, k = ∑ m = 1 M w n, m y k, m, n = 1,..., N k = 1,..., j wherein W n, m is an uplink active antenna system AAS antenna weight value corresponding to the n th transmit port and the m th receive port, and y k,m is an uplink signal on the m th path in the k th group of matching paths; and determining, according to energy of the equivalent signals at the N transmit ports, a downlink transmit beam used for sending a signal to a user equipment. separately acquiring multipath information of each receive port of M receive ports of a base station, wherein the multipath information is used to indicate at least one path corresponding to each receive port, and M is a positive integer; performing multipath matching between the M receive ports according to the multipath information to determine i groups of matching paths, wherein i is a positive integer; characterized by separately determining at least one equivalent signal at N transmit ports of the base station according to at least one uplink signal on the i groups of matching paths, wherein N is a positive integer, comprising selecting j groups of matching paths from the i groups of matching paths according to energy on the i groups of matching paths, wherein j is a positive integer, and 1≤j≤i; and separately performing weighted processing on the uplink signals of the j groups of matching paths to separately determine j equivalent signals at each transmit port of the N transmit ports, which comprises: for the k th group of matching paths among the j groups of matching paths, performing weighted processing on at least one uplink signal of the k th group of matching paths according to the following equation, so as to determine the k th equivalent signal z n,k at the n th transmit port of the N transmit ports: z n, k = ∑ m = 1 M w n, m y k, m, n = 1,..., N k = 1,..., j wherein W n, m is an uplink active antenna system AAS antenna weight value corresponding to the n th transmit port and the m th receive port, and y k,m is an uplink signal on the m th path in the k th group of matching paths; and determining, according to energy of the equivalent signals at the N transmit ports, a downlink transmit beam used for sending a signal to a user equipment. for the k th group of matching paths among the j groups of matching paths, performing weighted processing on at least one uplink signal of the k th group of matching paths according to the following equation, so as to determine the k th equivalent signal z n,k at the n th transmit port of the N transmit ports: z n, k = ∑ m = 1 M w n, m y k, m, n = 1,..., N k = 1,..., j wherein W n, m is an uplink active antenna system AAS antenna weight value corresponding to the n th transmit port and the m th receive port, and y k,m is an uplink signal on the m th path in the k th group of matching paths; and determining, according to energy of the equivalent signals at the N transmit ports, a downlink transmit beam used for sending a signal to a user equipment.