Abstract: This paper estimates high-resolution radial velocity and range profile of moving target for Ultra- WideBand (UWB) radar via State-Space (SS) method. First, an impulse response of scatterers in frequency domain is obtained by utilizing the echo with stretching in UWB radar to get the Hankel matrix used in SS method. Second, through SS, the radial velocity and range profile of target moving at high speed are estimated for UWB radar. The corresponding Cramr-Rao Lower Bound (CRLB) is further derived. This method is not only can estimate the high resolution range profile of the target, but also can avoid the variation of Doppler with the frequency in the bandwidth of signal, i.e., the influence of Doppler dispersion on radial velocity estimates. Also, this method has fine noise-rejection ability. Besides, due to only acquiring the impulse response in frequency domain and no considering the special waveform, the method there is not the restriction of the transmitted waveform, which is greatly different with wavelet transform. The simulation results corroborate the feasibility and effectivity of this method.