Abstract: In this paper, a new evaluation method for synthetic aperture radar (SAR) jamming is proposed.  This method is mainly based on the concept of structure similarity index and it’s characteristic feature is consistent with perceptual property of human visual system (HVS). Firstly the jammed image and the primitive image are wavelets decomposed; secondly structure similarities are calculated for each subband in wavelet domain and each subbands’ structure similarity is weighted by contrast sensitivity function; at last it comes to the final evaluation index by summing up all weighted structure similarities. Simulation results shows that this index can not only measure the amount of the disturbance between the jammed and the primitive SAR image, but also reflect how people’s subjective feelings to the image quality in a better way compared with ordinary evaluation index, and reflect the difference of information loss when the interfere energy distributes in different regions in the image.