A method for sending Hybrid Automatic Repeat Request-Acknowledge, HARQ-ACK, information, comprising: when a terminal is configured to employ a Physical Uplink Control Channel, PUCCH, format 3 to transmit HARQ-ACK information and the HARQ-ACK information is transmitted over a Physical Uplink Shared Channel, PUSCH, the terminal determining the number of downlink subframes for serving cells to feed back the HARQ-ACK information; the terminal determining the number of encoded modulated symbols required for sending the HARQ-ACK information according to the determined number of the downlink subframes; the terminal mapping the HARQ-ACK information to be sent to the PUSCH of a specified uplink subframe according to the number of the encoded modulated symbols, and sending the HARQ-ACK information; characterized in that the terminal determining the number of downlink subframes for the serving cells to feed back the HARQ-ACK information comprises: when PUSCH transmission is based on a DCI format 0/4, the terminal determining the number of the downlink subframes according to uplink and downlink configurations of the serving cells and DAI signaling in the DCI format 0/4; and wherein the terminal determining the number of the downlink subframes according to the uplink and downlink configurations of the serving cells and the DAI signaling in the DCI format 0/4 comprises: if the uplink and downlink configurations of the serving cells are {1, 2, 3, 4, 6}, then obtaining the number of the downlink subframes by calculating according to the following formula: B c DL = min W DAI UL M c, wherein B c DL is the number of the downlink subframes, min represents taking a minimum value, M c is the number of downlink subframes within a bundling window corresponding to the specified uplink subframe, and W DAI UL is the value of the DAI signaling in the DCI format 0/4. when a terminal is configured to employ a Physical Uplink Control Channel, PUCCH, format 3 to transmit HARQ-ACK information and the HARQ-ACK information is transmitted over a Physical Uplink Shared Channel, PUSCH, the terminal determining the number of downlink subframes for serving cells to feed back the HARQ-ACK information; the terminal determining the number of encoded modulated symbols required for sending the HARQ-ACK information according to the determined number of the downlink subframes; the terminal mapping the HARQ-ACK information to be sent to the PUSCH of a specified uplink subframe according to the number of the encoded modulated symbols, and sending the HARQ-ACK information; characterized in that the terminal determining the number of downlink subframes for the serving cells to feed back the HARQ-ACK information comprises: when PUSCH transmission is based on a DCI format 0/4, the terminal determining the number of the downlink subframes according to uplink and downlink configurations of the serving cells and DAI signaling in the DCI format 0/4; and wherein the terminal determining the number of the downlink subframes according to the uplink and downlink configurations of the serving cells and the DAI signaling in the DCI format 0/4 comprises: if the uplink and downlink configurations of the serving cells are {1, 2, 3, 4, 6}, then obtaining the number of the downlink subframes by calculating according to the following formula: B c DL = min W DAI UL M c, wherein B c DL is the number of the downlink subframes, min represents taking a minimum value, M c is the number of downlink subframes within a bundling window corresponding to the specified uplink subframe, and W DAI UL is the value of the DAI signaling in the DCI format 0/4. characterized in that the terminal determining the number of downlink subframes for the serving cells to feed back the HARQ-ACK information comprises: when PUSCH transmission is based on a DCI format 0/4, the terminal determining the number of the downlink subframes according to uplink and downlink configurations of the serving cells and DAI signaling in the DCI format 0/4; and wherein the terminal determining the number of the downlink subframes according to the uplink and downlink configurations of the serving cells and the DAI signaling in the DCI format 0/4 comprises: if the uplink and downlink configurations of the serving cells are {1, 2, 3, 4, 6}, then obtaining the number of the downlink subframes by calculating according to the following formula: B c DL = min W DAI UL M c, wherein B c DL is the number of the downlink subframes, min represents taking a minimum value, M c is the number of downlink subframes within a bundling window corresponding to the specified uplink subframe, and W DAI UL is the value of the DAI signaling in the DCI format 0/4.