Abstract: Inverse Synthetic Aperture Radar(ISAR) is propitious to detect the space targets for its advantages in the space resolution.ISAR can acquire high resolution range profile by adopting wide bandwidth signal,and simultaneously,it can obtain the refined cross-range by the coherent accumulation of the different rotating angle echoes of the target.The high resolution of the two-dimension image acquired by ISAR can provide better characteristics of the target.In this paper,an experimental reserach of ISAR system is proposed to image the space target.