A control information transmission method for a base station, comprising: configuring a data channel transmission mode; determining a downlink control information DCI format set corresponding to the transmission mode, wherein the DCI format set comprises a first DCI format, and the first DCI format comprises single-codeword control information; and wherein, the DCI format set further comprises a second DCI format, the second DCI format comprises dual-codeword control information, and a data channel scheduled based on the second DCI format uses a closed loop MIMO transmission manner that is precoded based on channel information and comprised of one or more layers; and sending, according to the DCI format set, control signaling corresponding to the DCI format set to a user equipment; wherein the method further comprise: determining that data transmitted over the data channel scheduled in the first DCI format is a retransmitted codeword; and determining, according to antenna configuration information comprised in the first DCI format, that the number of layers occupied by the retransmitted codeword is greater than or equal to two layers, or that the number of layers occupied by the retransmitted codeword is equal to the number of layers occupied by an initially transmitted codeword corresponding to the retransmitted codeword; or determining, according to the antenna configuration information, that the retransmitted codeword uses a preconfigured antenna port, or that the retransmitted codeword uses a same antenna port as that of the initially transmitted codeword corresponding to the retransmitted codeword; or determining, according to the antenna configuration information, that the retransmitted codeword uses a preconfigured precoding matrix identifier; the antenna configuration information comprises at least one of codeword information, antenna port information, reference signal scrambling code identifier information, precoding matrix identifier information, and information about the number of space layers. configuring a data channel transmission mode; determining a downlink control information DCI format set corresponding to the transmission mode, wherein the DCI format set comprises a first DCI format, and the first DCI format comprises single-codeword control information; and wherein, the DCI format set further comprises a second DCI format, the second DCI format comprises dual-codeword control information, and a data channel scheduled based on the second DCI format uses a closed loop MIMO transmission manner that is precoded based on channel information and comprised of one or more layers; and sending, according to the DCI format set, control signaling corresponding to the DCI format set to a user equipment; wherein the method further comprise: determining that data transmitted over the data channel scheduled in the first DCI format is a retransmitted codeword; and determining, according to antenna configuration information comprised in the first DCI format, that the number of layers occupied by the retransmitted codeword is greater than or equal to two layers, or that the number of layers occupied by the retransmitted codeword is equal to the number of layers occupied by an initially transmitted codeword corresponding to the retransmitted codeword; or determining, according to the antenna configuration information, that the retransmitted codeword uses a preconfigured antenna port, or that the retransmitted codeword uses a same antenna port as that of the initially transmitted codeword corresponding to the retransmitted codeword; or determining, according to the antenna configuration information, that the retransmitted codeword uses a preconfigured precoding matrix identifier; the antenna configuration information comprises at least one of codeword information, antenna port information, reference signal scrambling code identifier information, precoding matrix identifier information, and information about the number of space layers. determining that data transmitted over the data channel scheduled in the first DCI format is a retransmitted codeword; and determining, according to antenna configuration information comprised in the first DCI format, that the number of layers occupied by the retransmitted codeword is greater than or equal to two layers, or that the number of layers occupied by the retransmitted codeword is equal to the number of layers occupied by an initially transmitted codeword corresponding to the retransmitted codeword; or determining, according to the antenna configuration information, that the retransmitted codeword uses a preconfigured antenna port, or that the retransmitted codeword uses a same antenna port as that of the initially transmitted codeword corresponding to the retransmitted codeword; or determining, according to the antenna configuration information, that the retransmitted codeword uses a preconfigured precoding matrix identifier; the antenna configuration information comprises at least one of codeword information, antenna port information, reference signal scrambling code identifier information, precoding matrix identifier information, and information about the number of space layers.