A control information transmission method, comprising: sending, by a base station, first control information on a second carrier, wherein the first control information is used by the base station to send data on a first carrier according to the first control information; and sending, by the base station, the data on the first carrier according to the first control information, wherein duration of a transmission time interval of the first carrier is less than duration of a transmission time interval of the second carrier; wherein the method is characterized by: sending, by the base station, carrier indication information on a third carrier, wherein the carrier indication information is used to indicate a carrier on which the data that is sent by the base station according to the first control information is located; and wherein the first control information comprises first time-frequency resource indication information, the first time-frequency resource indication information is used to indicate a time-frequency resource used by the base station to send the data on the first carrier; sending, by the base station, second control information on a fourth carrier; and the sending, by the base station, the data on the first carrier according to the first control information comprises: sending, by the base station, the data on the first carrier according to the first control information and the second control information, wherein the second control information comprises second time-frequency resource indication information, the second time-frequency resource indication information is used to indicate a time-frequency resource used by the base station to send the data on the first carrier, duration of a transmission time interval of the fourth carrier is greater than the duration of the transmission time interval of the second carrier, and the time-frequency resource of the first carrier that is indicated by the second time-frequency resource indication information comprises the time-frequency resource of the first carrier that is indicated by the first time-frequency resource indication information. sending, by a base station, first control information on a second carrier, wherein the first control information is used by the base station to send data on a first carrier according to the first control information; and sending, by the base station, the data on the first carrier according to the first control information, wherein duration of a transmission time interval of the first carrier is less than duration of a transmission time interval of the second carrier; wherein the method is characterized by: sending, by the base station, carrier indication information on a third carrier, wherein the carrier indication information is used to indicate a carrier on which the data that is sent by the base station according to the first control information is located; and wherein the first control information comprises first time-frequency resource indication information, the first time-frequency resource indication information is used to indicate a time-frequency resource used by the base station to send the data on the first carrier; sending, by the base station, carrier indication information on a third carrier, wherein the carrier indication information is used to indicate a carrier on which the data that is sent by the base station according to the first control information is located; and wherein the first control information comprises first time-frequency resource indication information, the first time-frequency resource indication information is used to indicate a time-frequency resource used by the base station to send the data on the first carrier; sending, by the base station, second control information on a fourth carrier; and the sending, by the base station, the data on the first carrier according to the first control information comprises: sending, by the base station, the data on the first carrier according to the first control information and the second control information, wherein the second control information comprises second time-frequency resource indication information, the second time-frequency resource indication information is used to indicate a time-frequency resource used by the base station to send the data on the first carrier, duration of a transmission time interval of the fourth carrier is greater than the duration of the transmission time interval of the second carrier, and the time-frequency resource of the first carrier that is indicated by the second time-frequency resource indication information comprises the time-frequency resource of the first carrier that is indicated by the first time-frequency resource indication information.