A method and terminal for feeding back channel status information, include: when the channel status information is fed back on the physical uplink control channel, code words contained in the used codebook CPUCCH(r) with a layer number or rank being r is a subset of the code words contained in the codebook CPUSCH(r) with a layer number or rank being r in the overall codebook defined in the LTE-A; wherein, the CPUCCH(r) is a single codebook or a single codebook equivalent to dual codebooks; and the CPUSCH(r) is a single codebook or a single codebook equivalent to the dual codebooks; and the single codebook equivalent to the dual codebooks refers to an actually defined single codebook in which 2 pre-coding matrix identifiers are required to determine the codebook of the code words therein for an established r.