Abstract:Based on the multi-scale idea,the paper presented a method of multi-scale inversion of wave equation.The basic ideas of the method are as follows:multi-scale decomposition of inverted objective function and inversion is conducted by using normalization method under each scale,which overcome the ill-posedness of inversion problem,acquired global optimum solution and improved resolution and hi-fi of inverted results.The paper uses wavelet transform to conduct multi-scale inversion.The better estimation of parameters is acquired first by inversion in large scale,then the estimated values are taken as initial values in smaller scale to invert until the global optimum solution is obtained.The application cases showed that the method has advantages of low dependence on initial model,rapid convergent speed and stable inverted results.