The historical development of multi-channel Synthetic Aperture Radar (SAR) system is presented from three aspects of InSAR,SAR-GMTI and dual-/multi-channel cancellation technique,and theresearch progress of Electronic Counter-Countermeasure (ECCM) is summarized with focus on the status quo of multi-channel SAR ECM technique.With regard to multi-channel SAR ECCM,an introduction is made from two aspects: antenna/structure and signal waveform,and the characteristics of dual-/multi-channel cancellation technique are analyzed.As to multi-channel SAR ECM,the prospect of ECM is analyzed emphatically,and emphases are laid on the complexity of modulation,the coherency of interference,the multi-station distributed countermeasure and the multi-channel SAR ECCM.