Abstract: Resolution of the range profile is essential for target identification of broad band radar.To process the moving target echo of the ultra wide band radar, Doppler difference is compensated by using the Fractional Fourier Transform (Fr-FT)algorithm.The time delay information is turned into the Doppler domain.The data processed by FrFT is reprocessed by the multiple singnal classification(MUSIC) algorithm.Super resolution of range dimension is realized by using our approach, and its performance is superior to the conventional pulse compression or Dechirp method.It is useful for target identification.The efficiency of our approach is proven by computer simulation.