A precoding information collection method performed by a system comprising a transmit side and a receive side, the method comprising: • precoding, by the transmit side, a first pilot signal according to a first precoding matrix, and sending, by the transmit side, a precoded first pilot signal to the receive side, wherein the first precoding matrix is the same as a precoding matrix currently used for a current data transmission; • generating, by the transmit side, a precoding matrix for correction randomly, wherein a probability distribution of the generated precoding matrix for correction is within a preset range greater than o and is furthermore a Gaussian distribution; • generating, by the transmit side, a second precoding matrix being a sum of the first precoding matrix and the precoding matrix for correction (S 302); • precoding, by the transmit side, a second pilot signal according to the second precoding matrix, and sending, by the transmit side, the precoded second pilot signal to the receive side (S 302); • receiving, by the receive side, the precoded first pilot signal from the transmit side and receiving, by the receive side, the precoded second pilot signal from the transmit side; • demodulating, by the receive side, the precoded first pilot signal, thereby obtaining the first pilot signal, and demodulating, by the receive side, the precoded second pilot signal, thereby obtaining the second pilot signal; • obtaining, by the receive side, a signal quality of the first pilot signal and obtaining a signal quality of the second pilot signal; • determining, by the receive side, whether the signal quality of the first pilot signal is inferior to the signal quality of the second pilot signal; • if the signal quality of the first pilot signal is inferior to the signal quality of the second pilot signal, sending, by the receive side, first precoding feedback information back to the transmit side, wherein the first precoding feedback information is an acknowledgement indication used to indicate that the first precoding matrix is not used next time the transmit side transmits data to the receive side, • if the signal quality of the first pilot signal is superior or equal to the signal quality of the second pilot signal, sending, by the receive side, second precoding feedback information to the transmit side, wherein the second precoding feedback information is a non-acknowledgement indication used to indicate that the first precoding matrix is to be used by the transmit side for the next time the transmit side transmit data to the receive side; • receiving, by the transmit side, the first or second precoding feedback information from the receive side. • precoding, by the transmit side, a first pilot signal according to a first precoding matrix, and sending, by the transmit side, a precoded first pilot signal to the receive side, wherein the first precoding matrix is the same as a precoding matrix currently used for a current data transmission; • generating, by the transmit side, a precoding matrix for correction randomly, wherein a probability distribution of the generated precoding matrix for correction is within a preset range greater than o and is furthermore a Gaussian distribution; • generating, by the transmit side, a second precoding matrix being a sum of the first precoding matrix and the precoding matrix for correction (S 302); • precoding, by the transmit side, a second pilot signal according to the second precoding matrix, and sending, by the transmit side, the precoded second pilot signal to the receive side (S 302); • receiving, by the receive side, the precoded first pilot signal from the transmit side and receiving, by the receive side, the precoded second pilot signal from the transmit side; • demodulating, by the receive side, the precoded first pilot signal, thereby obtaining the first pilot signal, and demodulating, by the receive side, the precoded second pilot signal, thereby obtaining the second pilot signal; • obtaining, by the receive side, a signal quality of the first pilot signal and obtaining a signal quality of the second pilot signal; • determining, by the receive side, whether the signal quality of the first pilot signal is inferior to the signal quality of the second pilot signal; • if the signal quality of the first pilot signal is inferior to the signal quality of the second pilot signal, sending, by the receive side, first precoding feedback information back to the transmit side, wherein the first precoding feedback information is an acknowledgement indication used to indicate that the first precoding matrix is not used next time the transmit side transmits data to the receive side, • if the signal quality of the first pilot signal is superior or equal to the signal quality of the second pilot signal, sending, by the receive side, second precoding feedback information to the transmit side, wherein the second precoding feedback information is a non-acknowledgement indication used to indicate that the first precoding matrix is to be used by the transmit side for the next time the transmit side transmit data to the receive side; • receiving, by the transmit side, the first or second precoding feedback information from the receive side.