Feedback method and device

A feedback method and device. The method comprises: receiving, by a first transmission node, a signal which is sent by a second transmission node and contains a transmission block, wherein the transmission block comprises K code blocks, and the K code blocks are divided into P code block sets; according to the signal containing the transmission block, obtaining, by the first transmission node, the states of the P code blocks sets; according to the states of the P code blocks sets, determining, by the first transmission node, at least one kind of feedback information from a pre-set feedback information set, wherein the feedback information set at least comprises correct indication information and n kinds of incorrect indication information; and sending, by the first transmission node, the determined feedback information to the second transmission node. The technical solution of the present invention can effectively reduce the amount of retransmitted data and improve the data retransmission efficiency.