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A new practical approach for ground fast-moving target detection and imaging is presented for the three-channel SAR-Ground Moving Target Indication (SAR-GMTI) system based on the forward-looking configuration. Considering the facts that fast-moving targets defocus in SAR image and Doppler spectrum folding demands complicated processing, fast-moving targets after clutter suppression are refocused in order to detect these targets, in the procedure of which the Doppler spectrum is adequately compressed before range walk correction which avoids effectively Doppler spectrum folding. The simulation results validate the effectiveness of the approach presented in this paper.