Abstract: In the process of suppressing interference near the target position,the minimum variance distortionless response (MVDR) beamformer will appear the mainlobe distortion problem in the condition of mismatched steering vector and more array cells.To solve the problem,the CSB sin-FDA receiving array was used to replace the ULA-FDA receiving array,and the mismatched steering vector was modified based on the RCB algorithm,calculating the optimal power vector.Simulation test was carried out to validate the performance advantages of the proposed method,compared with the MVDR based on PA,MVDR based on FDA-BFF,and the MVDR based on FDA-MIMO.