A real-time data acquisition inverse synthetic aperture ladar system is designed.The continuous m-sequence phase modulation method is employed to image a rotating target at a distance of 33.5m by a 1550 nm laser with the average power of 2 W.The range-Doppler domain imaging result reveals the characteristic of the target,distinctly.In the imaging demonstration,the range resolution and the cross-range resolution are 18 cm and 1.576 kHz,respectively.