Method and apparatus for transmitting downlink control information (DCI) are provided. The method includes: scheduling traffic channels in multiple transmission time intervals (TTIs) through a single DCI, where a subcarrier spacing of a carrier where the scheduled traffic channel is located is not smaller than a subcarrier spacing of a carrier where the DCI scheduling the traffic channel is located; and transmitting the DCI. A problem of how to use a multi-TTI scheduling for a cross-carrier scheduling in which a subcarrier spacing of a scheduling carrier is smaller than a subcarrier spacing of a scheduled carrier in the related art may be solved, and the effects of scheduling the multiple TTIs through a single DCI and reducing the overhead are achieved.