Abstract: UWB (ultra-wideband) scattering signal can provide direct observation of time signatures and natural time-gating. This feature is useful in identifying structural response mechanisms and is essential when realizing the inverse scattering target imaging. With the development of UWB pulser and antenna and waveform sampling, the acquisition of UWB scattering signal in time-domain become available gradually. In this paper, the mea surement technology in time-domain and data processing method of scattering pulse from the perfect conductive scattered illuminated by UWB electromagnetic pulse is described. The physical mechanism of scattering, the procedure for measurement and distillation of scattering signal and the method of calculating the impulse response of scattering object is also depicted