Abstract: Pyroclastic rock reservoir is very thin in the second member of Yingcheng Formation in Lower Cretaceous of Wukeshu area in Yingtai Rift, Songliao Basin. Longitudinal wave impedance difference is small, serious and range overlay routine impedance inversion method is difficult to identify reservoir. Based on seismic data frequency broadening, stacked seismic statistical inversion method is used and solves this problem effectively. The dominant frequency band of the target layer is broadened, energy is increased, and the main frequency is increased significantly, by the use of deep frequency broadening technology. Poststack geostatistics takes into account the vertical resolution of seismic data and the lateral resolution of logging data. By taking the poststack constrained sparse spike inversion of the wave impedance of the body as hard constraints on data, the relationship between impedance and reservoir parameters is established. The effective reservoir distribution obtained from inversion and the effective reservoir displayed by drilling reveals high degree of agreement, which could reflect the change in reservoir properties. Joint research on seismic data processing and seismic data inversion method could reach better result for solving thin reservoir spatial distribution characteristics.