Abstract: In this paper,we discussed the Wigner-Ville spectrum of backscattering processes of moving medium,which equals the convolution of the power spectrum on static medium with the additional spectrum due to medium movement.There are Dopplcr frequency shift and split,widening and non-symmetric of spectrum peak in WV spectrum due to the additional attribution of medium movement.The number of spectrum peaks may be one,three or two with increasing non-stationarity of medium movement,which correspond to the quasi-stationary area,non-stationary area and strong non-stationary area of medium movement respectively.