Abstract: Dual-channel SAR system and single-look InSAR system are characterized by strong anti-interference capability. In this paper, a countermeasure method against dual-channel cancellation is proposed based on two jammers, the principle of dual-channel cancellation is reviewed, the interference signals of two jammers are analyzed, the requirement of the interference phase of the two jammers and the estimation method are studied. Theoretical analysis and simulation experiment verify the effectiveness of the proposed method.