Abstract: Spectrum inversion is a kind of a priori information and spectral decomposition technique is used to speed up less than tuning thickness of thin layer imaging seismic processing technology. This paper discusses the construction process of objective function in spectrum inversion, and the inversion method is studied. Next, I process actual data of some region of Daqing by spectrum inversion. We can find the resolution of seismic profiles is improved, and the information of high frequency part also has greatly increased.