High range resolution (HRR) moving target indicator (MTI) is becoming increasingly important for many military and dvilian applications such as the detection and dassification of moving targets in strong clutter background. We consider the problem of extracting the HRR features of moving targets with very dosely spaced scatterers in the presence of strong stationary clutter, where the range migration and Vopplel\"frequency are taken into account. A relaxation-based algorithm，which is robust and computationally simple, is propOsed to deal with the above problem. Numerical results have shown that the proposed algorithm exhibits super resolution and excellent estimation performance.