Abstract: The paper considers the anti-jamming of SAR,based on the analyzing jiamming methods in existence, puts forward a new jamming which is a time, frequency and dopple fields multidimensional-overcast similar clutter's jamming. Through the Zero Memory NonLinearity (ZMNL) method, generates of the correlated log normal, Weibull and K-distributed clutter vectors, and deeply researchs the method of similar clutter jamming based on the digital frequency memorizer. Finally, this method is proved to be effectual to SAR jamming through the matlab emulators. By using the similar jamming signal to the SAR, the method can receive the SAR's process gains and reduce the jamming energy. Compared with cheat jamming, it may reduce the need for the parameters's precision, so it is realizable.