The range resolution of inverse synthetic aperture radar (ISAR) is limited by the bandwidth of signal. Therefore, ISAR cannot supply high enough imaging resolution for long distance targets, small targets, and so on. A new radar system which is called inverse synthetic aperture imaging laser radar (ISAIL) is proposed in this paper. The use of ISAIL can realize real time and high resolution imaging for moving target with the laser signal's large bandwidth and short wavelength. In this paper, the imaging theory of ISAIL is analyzed, the characters of laser signal and moving target are researched, and the system design project is proposed. Simulation shows that the images achieved by this ISAIL are of higher quality and within shorter time than those achieved by ISAR.