Abstract: An inversion method of amplitude parameter of bottom reflection coefficient with reverberation attenuation characteristic had been presented.Introduced the amplitude parameter and phase-shift parameter of reflection coefficient into reverberation model as theory basis of inversion.Digital simulation had been made to pause it was feasibility and accurate to extract bottom reflection coefficient amplitude parameter with reverberation data at small grazing angle.There were four parameters,reverberation attenuation characteristic,phase parameter of bottom reflection coefficient,sea depth and sound speed at sea floor,to input into this inversion method.At the same time,Reverberation to Noise Ratio(RNR) should be larger than 6 dB.The bottom reflection coefficient amplitude parameter had been extracted successfully based on monstatic reverberation data came from sea experiment.