Abstract: The conventional seismic inversion imaging is divided into migration velocity analysis (MVA) and tomography,prestack migration imaging and AVA analysis/inversion.The key techniques in the three inversion imaging methods are the core technologies of modern exploration seismology.Full waveform inversion (FWI) is a complete theoretical framework of seismic inversion imaging,and which can roll up the three conventional inversion imaging methods into one and give a desired imaging result in principle.However,due to the incompleteness of pre-stack seismic data,imperfectness of forward model,inaccuracy of initial model,unknown and spatial variation of seismic wavelet,the practical problems have not yet been solved with FWI method in the strict sense.In this paper we analyze the existing problems of classical FWI method and propose a practical seismic inversion imaging workflow,that is to divide classic FWI into transmissive wave tomography,LS-PSDM imaging and reflections tomography.Aimed at the features of land seismic data,we point out that the establishment of shallow velocity model,background velocity model,velocity model for CIG tomography,LS-PSDM imaging,generation of the incident angle gather and dip angel gather,impedance inversion by small angel CIG gathers are crucial for the promotion of the application and self-development of FWI technique.