Abstract: In this paper,the ultrasonic spectra of liver's structural scattering were obtained by using autoregressive model,and the spectral characteristics were analyzed statistically.The results indicate that a liver can be divided into three distinguished scattering region.Refered to the microstructural characteristics of liver,s different parts,the results were discussed.And finally,the application prospect of spectral characteristics of tissue's regional structural scattering in clinic is pointed out.