A method for adjusting transmit powers of base station antennas, comprising: receiving an input precoding matrix of a transmit power-limited antenna set, wherein the precoding matrix is determined according to a scheduling result of a user equipment communicating with a base station in each layer of each subband in a system; and adjusting the precoding matrix according to a transmit power limit requirement of the transmit power-limited antenna set to obtain an adjusted precoding matrix, and adjusting a stream transmit power of the transmit power-limited antenna set by using the adjusted precoding matrix, wherein the stream transmit power of the transmit power-limited antenna set is a sum of powers for transmitting a stream of the transmit power-limited antenna set on all antennas in the transmit power-limited antenna set, and the stream is data sent in a layer of a subband in the system to the user equipment; characterized in that the adjusting the precoding matrix according to a transmit power limit requirement of the transmit power-limited antenna set to obtain an adjusted precoding matrix, and adjusting a stream transmit power of the transmit power-limited antenna set by using the adjusted precoding matrix comprise: obtaining a power matrix according to the precoding matrix, wherein a sum of powers in a row of the power matrix is an antenna transmit power of an antenna, and a sum of powers in a column is a stream transmit power of a stream; and obtaining a largest antenna transmit power according to the power matrix; adjusting, by using the largest antenna transmit power and a preset antenna power threshold, the precoding matrix to obtain an adjusted precoding matrix; and adjusting a stream transmit power of at least one stream by using the adjusted precoding matrix, wherein the stream transmit power of each of the at least one stream corresponds to each of at least one column of the power matrix, wherein the at least one column is at least one column that comes first in the power matrix after all columns are sorted in descending order of powers in a row that has the largest antenna transmit power. receiving an input precoding matrix of a transmit power-limited antenna set, wherein the precoding matrix is determined according to a scheduling result of a user equipment communicating with a base station in each layer of each subband in a system; and adjusting the precoding matrix according to a transmit power limit requirement of the transmit power-limited antenna set to obtain an adjusted precoding matrix, and adjusting a stream transmit power of the transmit power-limited antenna set by using the adjusted precoding matrix, wherein the stream transmit power of the transmit power-limited antenna set is a sum of powers for transmitting a stream of the transmit power-limited antenna set on all antennas in the transmit power-limited antenna set, and the stream is data sent in a layer of a subband in the system to the user equipment; characterized in that the adjusting the precoding matrix according to a transmit power limit requirement of the transmit power-limited antenna set to obtain an adjusted precoding matrix, and adjusting a stream transmit power of the transmit power-limited antenna set by using the adjusted precoding matrix comprise: obtaining a power matrix according to the precoding matrix, wherein a sum of powers in a row of the power matrix is an antenna transmit power of an antenna, and a sum of powers in a column is a stream transmit power of a stream; and obtaining a largest antenna transmit power according to the power matrix; adjusting, by using the largest antenna transmit power and a preset antenna power threshold, the precoding matrix to obtain an adjusted precoding matrix; and adjusting a stream transmit power of at least one stream by using the adjusted precoding matrix, wherein the stream transmit power of each of the at least one stream corresponds to each of at least one column of the power matrix, wherein the at least one column is at least one column that comes first in the power matrix after all columns are sorted in descending order of powers in a row that has the largest antenna transmit power. obtaining a power matrix according to the precoding matrix, wherein a sum of powers in a row of the power matrix is an antenna transmit power of an antenna, and a sum of powers in a column is a stream transmit power of a stream; and obtaining a largest antenna transmit power according to the power matrix; adjusting, by using the largest antenna transmit power and a preset antenna power threshold, the precoding matrix to obtain an adjusted precoding matrix; and adjusting a stream transmit power of at least one stream by using the adjusted precoding matrix, wherein the stream transmit power of each of the at least one stream corresponds to each of at least one column of the power matrix, wherein the at least one column is at least one column that comes first in the power matrix after all columns are sorted in descending order of powers in a row that has the largest antenna transmit power.