According to the research status of multi-radar signal processing based on sparse representation and related fields, the method of using multi-ISAR to detect the target to improve the imaging efficiency is proposed. The linear error and angle estimation error in multi-radar imaging are clarified, and a multi-radar signal interference processing method based on signal sparse representation is proposed. By using the sparse characteristics of amplitude and phase compensation parameters, the compensation parameters are estimated by signal sparse reconstruction method, and the future research directions are prospected. The results show that it can improve the practical ability of ISAR multi-radar under sparse conditions.