In order to generate multiple false targets and interfere the advanced chirp rate agile LFM( linear frequency modulation) radars, a group false-target jamming method with stable position, based on intermittent sampling repeater jamming and bidirectional shift-frequency modulation, was proposed. The intermittent sampling frequency and frequency shift modulation were obtained by mixing the radar signal with two time-delay signals at the same time. The interference signal was obtained by intermittent sampling and repeating processing and bidirectional frequency shift modulation processing in sequence. Theoretical analysis and simulation experiments show that the position of the false target group generated by this jamming method is constant for advanced LFM radar systems such as frequency modulation slope agility. The proposed method is conducive to forming good interference effects during pulse accumulation. Meanwhile, compared with the intermittent sampling repeater jamming or the shift-frequency jamming, the range of group false targets via the proposed method is more wider, which is valuable in practical engineering applications.