Abstract:After detailedly analysing the common wave impedance inversion methods which take single trace computation,we developed an easy mufti-trace inversion method. It consists of following steps:·Combine the mid-frequency component with low-frequency component,by using normalized filtering operator in frequency domain,to form an initial model for mufti-trace inversion without borehole data. .Obtain the minimum-phase inverse wavelet,by taking ordinary least square method,to get wavelet,which is then converted into zero phase wavelet.·Separate off signals and noises(or suppress noises)of fitted data difference section. Application effect shows that this method is much better than usual singletrace inversion methods.