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In LTE-advance,increasing the system and cell-edge throughput by using coordinated multi-point(CoMP)transmission is of particular interest.In COMP how to lower the feedback is a key problem.It is known that a codebook based precoding can provide system benefit.And feedback can be reported in two manners:joint report and disjoint report.joint report means The UE reports a single report which is computed jointly for all the cells.Disjoint report means The report is computed separately for each of the cells.Joint report can be designed in two manners:joint design and disjoint design.Though joint design get more system benefit.it is not flexible enough.Then disjoint design is introduced.The codebook is formed by concatenating common single-cell codebooks.And we improve disjoint design codebook by feedback some more information.we compare the improved codebook with original one by simulation and prove that the improved codebook is better.