A method for transmitting channel state information for a Licensed-Assisted Access system, comprising: sending, by a base station, carrier indication information to a user equipment, UE, wherein the carrier indication information is used to indicate a carrier resource used when the UE sends channel state information of an unlicensed carrier; receiving, by the base station, channel state information sent by the UE, on the carrier resource indicated by the carrier indication information; wherein the method further comprises preempting, by the base station, the carrier resource on an unlicensed carrier in a Listen-Before-Talk manner, wherein the base station instructs, by using the carrier indication information, the UE to send the channel state information by using the preempted unlicensed carrier; or when the carrier resource indicated by the carrier indication information is not obtained by means of preemption, the base station instructs, by using the carrier indication information, the UE to send the channel state information by using a licensed carrier; wherein the sending, by the base station, the carrier indication information to the UE comprises: sending, by the base station, the carrier indication information to the UE using downlink control information, DCI, wherein the DCI carries a channel state information, CSI, request and the carrier indication information, the CSI request is used to request the UE to send the channel state information of the unlicensed carrier, and wherein the carrier indication information is represented by a newly-added bit indicator in the DCI; or the carrier indication information is represented by an unused bit indicator in the DCI; or the carrier indication information is represented by bit information that does not have an indication meaning in the DCI. sending, by a base station, carrier indication information to a user equipment, UE, wherein the carrier indication information is used to indicate a carrier resource used when the UE sends channel state information of an unlicensed carrier; receiving, by the base station, channel state information sent by the UE, on the carrier resource indicated by the carrier indication information; wherein the method further comprises preempting, by the base station, the carrier resource on an unlicensed carrier in a Listen-Before-Talk manner, wherein the base station instructs, by using the carrier indication information, the UE to send the channel state information by using the preempted unlicensed carrier; or when the carrier resource indicated by the carrier indication information is not obtained by means of preemption, the base station instructs, by using the carrier indication information, the UE to send the channel state information by using a licensed carrier; wherein the sending, by the base station, the carrier indication information to the UE comprises: sending, by the base station, the carrier indication information to the UE using downlink control information, DCI, wherein the DCI carries a channel state information, CSI, request and the carrier indication information, the CSI request is used to request the UE to send the channel state information of the unlicensed carrier, and wherein the carrier indication information is represented by a newly-added bit indicator in the DCI; or the carrier indication information is represented by an unused bit indicator in the DCI; or the carrier indication information is represented by bit information that does not have an indication meaning in the DCI. sending, by the base station, the carrier indication information to the UE using downlink control information, DCI, wherein the DCI carries a channel state information, CSI, request and the carrier indication information, the CSI request is used to request the UE to send the channel state information of the unlicensed carrier, and wherein the carrier indication information is represented by a newly-added bit indicator in the DCI; or the carrier indication information is represented by an unused bit indicator in the DCI; or the carrier indication information is represented by bit information that does not have an indication meaning in the DCI.