A method for transmitting channel state information by a user equipment, comprising: determining to-be-reported channel state information, CSI, that corresponds to more than one downlink carriers, wherein the to-be-reported CSI comprises at least one CSI report, and each CSI report of the at least one CSI report corresponds to each downlink carrier of the more than one downlink carriers respectively; and sending the to-be-reported CSI to a base station through a physical uplink channel; wherein the determining to-be-reported CSI comprises: when one or more CSI reports that need to be reported on a same subframe correspond to at least two physical uplink channel resources, determining, among the one or more CSI reports, a part or all of CSI reports corresponding to a physical uplink channel resource with the highest priority in the at least two physical uplink channel resources as the at least one CSI report included in the to-be-reported CSI, characterized in that: among the at least two physical uplink channel resources, the physical uplink channel resource with the highest priority is a physical uplink channel resource corresponding to a CSI report of a reporting type that has the highest priority, or a physical uplink channel resource corresponding to a CSI report of a downlink carrier that has the minimum carrier index, or a physical uplink channel resource corresponding to a maximum number of carriers. determining to-be-reported channel state information, CSI, that corresponds to more than one downlink carriers, wherein the to-be-reported CSI comprises at least one CSI report, and each CSI report of the at least one CSI report corresponds to each downlink carrier of the more than one downlink carriers respectively; and sending the to-be-reported CSI to a base station through a physical uplink channel; wherein the determining to-be-reported CSI comprises: when one or more CSI reports that need to be reported on a same subframe correspond to at least two physical uplink channel resources, determining, among the one or more CSI reports, a part or all of CSI reports corresponding to a physical uplink channel resource with the highest priority in the at least two physical uplink channel resources as the at least one CSI report included in the to-be-reported CSI, characterized in that: among the at least two physical uplink channel resources, the physical uplink channel resource with the highest priority is a physical uplink channel resource corresponding to a CSI report of a reporting type that has the highest priority, or a physical uplink channel resource corresponding to a CSI report of a downlink carrier that has the minimum carrier index, or a physical uplink channel resource corresponding to a maximum number of carriers. when one or more CSI reports that need to be reported on a same subframe correspond to at least two physical uplink channel resources, determining, among the one or more CSI reports, a part or all of CSI reports corresponding to a physical uplink channel resource with the highest priority in the at least two physical uplink channel resources as the at least one CSI report included in the to-be-reported CSI, characterized in that: among the at least two physical uplink channel resources, the physical uplink channel resource with the highest priority is a physical uplink channel resource corresponding to a CSI report of a reporting type that has the highest priority, or a physical uplink channel resource corresponding to a CSI report of a downlink carrier that has the minimum carrier index, or a physical uplink channel resource corresponding to a maximum number of carriers.