An objective of the present invention is to provide a method and apparatus for reporting CSI for superposition transmission. A first UE reports, based on a first BLER indicated by a corresponding base station, a first CSI corresponding to the first BLER to the base station; reports, based on at least one second BLER indicated by the base station, at least one second CSI corresponding to the at least one second BLER, to the base station, wherein the base station performs superposition transmission with the first UE and at least one second UE paired therewith, wherein a value of the at least one second BLER is different from a value of the first BLER. Compared with the prior art, the present invention does not require the UE to perform interference cancellation/ suppression during a CQI measurement period for the second CSI. Therefore, the present invention does not have the complication as found in the Post-NAICS CQI. The present invention designs some restrictions and/or changes some existing standards when generating a CSI report, such that the report is more useful and more beneficial to the superposition transmission schemes, which enhances system efficiency and promotes user experience.