A novel generation method of 2-D ISAR group targets is presented based on Intermittent-Sampling Repeater Jamming (ISRJ). Escort free-flight jammer was used to intermittently sample and repeater target echoes, which can generate vivid 2-D group targets in ISAR. By adjusting jammer and target’s relative space position, 2-D group targets are able to simulate target’s attitude angle dynamically. After the theory of ISRJ was expounded, the principle of escort free-flight jamming was introduced. A theoretical study was carried out to determine the requirement for power and position. Then the theoretical reason of 2-D group targets was emphatically analyzed. The key factor of false targets distribution and attitude angle was explored. Finally, the simulation demonstrates that the above method is effective. The results obtained from this research will help to provide better guidance for the design and engineering application of ISAR jammer.