ISRJ(interrupted-sampling repeater jamming) is an effective method to wideband imaging radar. According to the basic principle of ISRJ, when the jamming with conventional uniformly repeater is applied to wideband imaging radar, a string of uniformly spaced artificial scatters are overlain on the high resolution range profile. The artificial scatters′ characteristic of being uniformly spaced goes against with the camouflage of jamming signal. In order to solve this problem, based on the conventional ISRJ, a new jamming method using interrupted-sampling un-uniformly repeater, in which the main purpose was broken the uniformly spaced of artificial scatters, was put forward, and the effect of the new jamming method was also analyzed. Finally, by means of simulation, it is found that the new jamming method can promote jamming effect to wideband imaging radar.