A reconstruction algorithm of layered acoustic impedance profile has been established in this work. The thickness of the multi-layer medium to be reconstructed can be less than 50μm. The validity of the algorithm has been proved by computer simulation experiment results. In this paper

two deconvolution methods have been adopted and compared. One of them is called Wiener filtering and the other is called correlation method. To improve the resolution and the precision of the reconstruction

an after deconvolution processing method

namely

the moving threshold peak detection technique has been established. The simulation results also show that this impedance reconstruction algorithm can be performed in a high frequency situation （up to 18MHz） and the 48μm axial resoluton has been obtained.