Provided are a data transmission method and a terminal. In the method, a terminal receives Downlink Control Information (DCI) sent by a network side device; the terminal detects downlink data sent by the network side device based on the DCI; and the terminal determines, according to an index of a time element for transmitting downlink information or according to a time element offset between the time element for transmitting the downlink information and a time element for transmitting feedback information corresponding to the downlink data, a resource index of a target uplink control channel resource for transmitting the feedback information, the downlink information including at least one of the DCI and the downlink data.