Abstract: this paper, the basic principle of the timefrequency(TF) analysis, including wavelet transform, is depicted briefly. It's application on UWB scattering signal is introduced in detail also. Through the processing of UWB scattering signal from tested target with the aid of the TF analysis, the signature of the target can be gotten easily so that the detection and discrimination of the target might be improved. In the work, the measurement of scattering signal was made for some simple shaped metal targets which was in air or hidden in some kinds of soil and leaves using picosecond pulse generator (PPG) in the form of bistation configuration, and the experimental data was processed with pseudo Wigner distribution and Mayer wavelet transform. The analytical results prove the superiority