Abstract: The essence of radar anti-interference with polarimetry is to suppress or avoid the effects on radar exploring from the interference, by using the polarization difference between radar interference and radar target. Radar anti interference techniques with polarimetry has been applied successfully for several bottleneck problems, such as main-lobe interference suppression, decoy discrimination and anti angle deception jamming. Due to the upgrade of electronic countermeasure, the difference between interference and radar target echo becomes inconspicuous. As a result, it is imperative to research into the new radar anti-interference techniques which excavate fully and utilize synthetically all differences including polarimetry. Development history, key technologies, typical applications of radar anti-interference techniques with polarimetry are described in this paper.