Embodiments of the present invention provide a control information transmission method, a transmit end, and a receive end. The method includes: determining, by the transmit end, a first time domain resource used for sending scheduled data and a second time domain resource used for sending control information of the scheduled data in a transmission period, where the second time domain resource is a subset of the first time domain resource; and sending, by the transmit end, the control information on the second time domain resource, where the control information includes a parameter used to instruct the receive end to receive the scheduled data. Using the present invention can improve a success rate of data detection, shorten a transmission delay, and further improve reliability of a communications system.