Abstract: Based on the combination of finite amplitude insert-substitution method and computer tomography technique,the nonlinear parameter B/A imaging was created.Expertmental results of nonlinear parameter B/A tomography can be reconstructed by filtered convolution method for normal and several pathological porcine livers such as hepatocrirrhosis,hepatitis and fatty livers.For comparison the computer tomography of linear acoustic parameter is also preseoted here.Results indicated that these B/A images show the effectiveness,in the biological tissues characterization and its perspective in medical diagnosis.