LFM radar signal has coupling between the range and Doppler frequency.Based on the method of ladder wave jamming a method of random frequency-shift jamming was proposed.Random Doppler frequency-shift component was added in center frequency bandwidth of the positive and negative half and false targets could be generated randomly distributed around the real target.Random frequency-shifting technique has high randomness thus the radar cant obtain the position of the real target through frequency compensation of multi-false-target.The false-target generated by random frequency-shifting is partially adaptive to the radar thus the false-target range can be broadened.When the random frequency-shifting is close to radars center frequency the generated false-targets can even cover the real-target and achieve very good effect.