Abstract: Polarization mismatch and polarization time-varying will cause energy loss distortion of radar received signal, which will seriously affect the anti-jamming effect of radar sidelobe cancellation and sidelobe blanking. This paper establishes the polarization model of main and auxiliary antenna array, simulates and analyzes the influence of polarization mismatch on cancellation ratio and blanking logic, and distinguishes between pulse groups, between pulse changes, and within pulse changes, the influence of interference polarization time-varying on cancellation timing and blanking logic is simulated and analyzed. Finally,the conclusion of the influence of polarization on radar sidelobe cancellation and sidelobe blanking is given.