A method for data processing in a relay network, comprising: acquiring a channel quality parameter of at least one subcarrier of an incoming link and a channel quality parameter of at least one subcarrier of an outgoing link; and re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link when a difference between the acquired channel quality parameter value of the incoming link and the acquired channel quality parameter of the outgoing link is less than a first threshold and the acquired channel quality parameter of the incoming link and the acquired quality parameter of the outgoing link both are less than a second threshold; wherein the re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link comprises: arranging the subcarriers in descending order according to channel quality parameters of the subcarriers of the incoming link and the outgoing link, and re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link in one-to-one correspondence according to magnitude of the channel quality parameter values; or arranging the subcarriers in ascending order according to channel quality parameters of the subcarriers of the incoming link and the outgoing link, and re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link in one-to-one correspondence according to magnitude of the channel quality parameter values. acquiring a channel quality parameter of at least one subcarrier of an incoming link and a channel quality parameter of at least one subcarrier of an outgoing link; and re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link when a difference between the acquired channel quality parameter value of the incoming link and the acquired channel quality parameter of the outgoing link is less than a first threshold and the acquired channel quality parameter of the incoming link and the acquired quality parameter of the outgoing link both are less than a second threshold; wherein the re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link comprises: arranging the subcarriers in descending order according to channel quality parameters of the subcarriers of the incoming link and the outgoing link, and re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link in one-to-one correspondence according to magnitude of the channel quality parameter values; or arranging the subcarriers in ascending order according to channel quality parameters of the subcarriers of the incoming link and the outgoing link, and re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link in one-to-one correspondence according to magnitude of the channel quality parameter values. arranging the subcarriers in descending order according to channel quality parameters of the subcarriers of the incoming link and the outgoing link, and re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link in one-to-one correspondence according to magnitude of the channel quality parameter values; or arranging the subcarriers in ascending order according to channel quality parameters of the subcarriers of the incoming link and the outgoing link, and re-matching the subcarriers of the incoming link and the subcarriers of the outgoing link in one-to-one correspondence according to magnitude of the channel quality parameter values.