A method for determining the length of feedback response information and a related product. The method comprises the following steps: a terminal receives configuration signaling sent by a network side device, the configuration signaling comprising: indicating the maximum transmission delay of feedback response information; the terminal dynamically determines a hybrid automatic repeat request feedback time sequence; the terminal determines the total number of bits of a feedback response message to be transmitted according to the maximum transmission delay; the terminal sends the feedback response message to be transmitted with the total number of bits to the network side device. The technical solution provided by the present invention has the advantage of supporting the multiplex transmission of feedback response information in one transmission time unit in a new radio system.