To solve the failure of the conventional false target jamming against synthetic aperture radar ground moving targets indication (SAR-GMTI),a novel method named motion modulation false target jamming is put forward.Motion modulation is performed on the phase of the intercepted signal and then the modulation signal is forwarded out.The principle of the jamming is to make use of the motion characteristics of the modulation signal.The jamming will be broadened after SAR imaging,and the jamming cannot be eliminated after the channel cancellation of SAR-GMTI processing.The resisting performance of motion modulation jamming against multi-channel GMTI is analyzed.Simulation results show the effectiveness of the jamming.