Abstract: The target range migration may decrease the performance of the conventional moving target detection(MTD) coherent integration, which means that the accumulation time is restrained by target motion. The Keystone transform can correct target range migration, but it need to accurately estimate the target velocity, which is difficult to satisfy. In this paper, an algorithm of the wide-band linear frequency modulation signal decomposed into narrow-band multichannel signal to detect high speed targets is present, which does not require prior knowledge of the speed of high-speed moving target and can improves the wideband radar performance of detection of high speed target. The simulation results demonstrate the availability of the proposed method.