1. A method for processing Channel State Information (CSI), comprising: storing one or more sets of precoding codebook models which is the same as one or more sets of precoding codebook models stored at an Evolved Node B (eNodeB); determining a precoding codebook model for feeding back CSI; and sending the CSI to the eNodeB by adopting the determined precoding codebook model; wherein sending the CSI to the eNodeB by adopting the determined precoding codebook model comprises: determining codebook feedback accuracy for feeding back the CSI from stored feedback accuracy level information which is the same as feedback accuracy level information stored at the eNodeB; and sending the CSI to the eNodeB by adopting the determined precoding codebook model and the determined codebook feedback accuracy; or, quantizing the CSI by adopting the determined precoding codebook model; and sending codebook index information used for identifying the precoding codebook model and a phase parameter, corresponding to the precoding codebook model, obtained by quantization to the evolved Node B; or, determining number of feedback parameters for feeding back the CSI from level information of the number of feedback parameters which is the same as level information of the number of feedback parameters which is stored at the eNodeB; and sending the CSI to the eNodeB by adopting the determined precoding codebook model and the determined number of feedback parameters.