A channel state information, CSI, feedback method, comprising: receiving, by a user equipment UE, a coding sequence seed allocated by the base station to the UE; receiving, by the UE, a reference signal broadcast by a base station; performing channel estimation on a radio channel between the base station and the UE by using the reference signal, to obtain CSI and a channel quality parameter; adjusting the channel quality parameter according to a channel quality weight parameter, to obtain a channel statistic quality parameter; comparing the channel statistic quality parameter with a channel quality threshold; and feeding back the CSI to the base station when the channel statistic quality parameter exceeds the channel quality threshold wherein the feeding back the CSI to the base station comprises: generating an M-dimensional Gaussian random sequence according to the coding sequence seed, wherein M is an integer greater than 1; coding the CSI by using the M-dimensional Gaussian random sequence, to obtain an M-dimensional vector signal; and feeding back the M-dimensional vector signal to the base station by using M time-frequency sub-resources; wherein the adjusting the channel quality parameter according to a channel quality weight parameter, to obtain a channel statistic quality parameter comprises: determining that a product of the channel quality weight parameter and the channel quality parameter is the channel statistic quality parameter; and after the comparing the channel statistic quality parameter with a channel quality threshold, the method further comprises: when the channel statistic quality parameter exceeds the channel quality threshold, updating the channel quality weight parameter by using a step adjustment value, wherein the channel quality weight parameter after being updated is less than the channel quality weight parameter before being updated; or, when the channel statistic quality parameter does not exceed the channel quality threshold, updating the channel quality weight parameter by using the step adjustment value, wherein the channel quality weight parameter after being updated is greater than the channel quality weight parameter before being updated. receiving, by a user equipment UE, a coding sequence seed allocated by the base station to the UE; receiving, by the UE, a reference signal broadcast by a base station; performing channel estimation on a radio channel between the base station and the UE by using the reference signal, to obtain CSI and a channel quality parameter; adjusting the channel quality parameter according to a channel quality weight parameter, to obtain a channel statistic quality parameter; comparing the channel statistic quality parameter with a channel quality threshold; and feeding back the CSI to the base station when the channel statistic quality parameter exceeds the channel quality threshold wherein the feeding back the CSI to the base station comprises: generating an M-dimensional Gaussian random sequence according to the coding sequence seed, wherein M is an integer greater than 1; coding the CSI by using the M-dimensional Gaussian random sequence, to obtain an M-dimensional vector signal; and feeding back the M-dimensional vector signal to the base station by using M time-frequency sub-resources; generating an M-dimensional Gaussian random sequence according to the coding sequence seed, wherein M is an integer greater than 1; coding the CSI by using the M-dimensional Gaussian random sequence, to obtain an M-dimensional vector signal; and feeding back the M-dimensional vector signal to the base station by using M time-frequency sub-resources; wherein the adjusting the channel quality parameter according to a channel quality weight parameter, to obtain a channel statistic quality parameter comprises: determining that a product of the channel quality weight parameter and the channel quality parameter is the channel statistic quality parameter; and after the comparing the channel statistic quality parameter with a channel quality threshold, the method further comprises: when the channel statistic quality parameter exceeds the channel quality threshold, updating the channel quality weight parameter by using a step adjustment value, wherein the channel quality weight parameter after being updated is less than the channel quality weight parameter before being updated; or, when the channel statistic quality parameter does not exceed the channel quality threshold, updating the channel quality weight parameter by using the step adjustment value, wherein the channel quality weight parameter after being updated is greater than the channel quality weight parameter before being updated. when the channel statistic quality parameter exceeds the channel quality threshold, updating the channel quality weight parameter by using a step adjustment value, wherein the channel quality weight parameter after being updated is less than the channel quality weight parameter before being updated; or, when the channel statistic quality parameter does not exceed the channel quality threshold, updating the channel quality weight parameter by using the step adjustment value, wherein the channel quality weight parameter after being updated is greater than the channel quality weight parameter before being updated.