A data transmission method, a terminal and a base station are provided. The method includes: receiving a downlink control channel, and indication information for indicating a division of uplink resources and downlink resources in a time unit; determining uplink resources and/or downlink resources in a target time unit corresponding to the downlink control channel, according to the indication information, where the target time unit is the time unit in which a target transmission corresponding to the downlink control channel is located; and determining time field resources of the target transmission corresponding to the downlink control channel in the uplink resources or the downlink resources, and performing the target transmission in the time field resources.