Quality of pre-stack seismic data processing has a great effect on subsequent pre-stack inversion and reservoir prediction, so true amplitude information shall be protected as well as possible. In recent years, attention is increasingly paid to amplitude preservation of seismic processing techniques. However, the importance of evaluation system is somewhat overlooked. General researches can only evaluate its amplitude preservation qualitatively by subtracting the processed gathers from the original so as to see if it hurts the effective signal amplitude, which cannot quantitatively illustrate its influence on the following elastic inversion and evaluate its amplitude preservation comprehensively. In order to bridge the gap, proposed is a new feasible well control method of evaluating amplitude preservation toward pre- stack elastic inversion based on the idea of well control amplitude preservation processing and the application example proves its superiority on the conventional method, which is more accurate and comprehensive. Based on seismic data from Leijia Area in Liaohe Oilfield, the influence of twice spherical divergence compensation on real amplitude recovery and the following inversion is deeply researched, which offers referential experience for seismic data processing.