Based on the characteristics of time delay and frequency shift of linear frequency modulation radar,the traditional intermittent sampling jamming is improved,which makes up for the shortcomings of traditional methods in dealing with some new type of anti-interference modes. The improved method uses the product of time domain signals and signal delay conjugate,and false target position controlling model is given through theoretical derivation. It is found that position of false target is unrelated to the frequency modulation slope. So it is proved that the improved method is superior to the traditional method. Finally,the effectiveness of the improved method is verified through simulation experiment. The simulation analysis and discussion are carried out from two aspects of the interference power and the flexibility of the false target position setting. The results show that it would be better to determine firstly the number of extended order and then calculate the required delay,which can not only obtain a larger signal gain,but also more flexible in the false target setting.