Considering the P-impedance overlap of sand-shale, the faint AVO response and the complex reservoir conditions at the target zone in LHK field, the authors applied the pre-stack elastic parameters to predicting the distribution of hydrocarbon. This technique system includes three critical steps, i.e., filtering of sensitive parameters by analysis of fluid substitution and elastic parameters cross-plot, wavelet estimation in different partial stacks and fine synthetic seismogram correlation, and elastic parameters inversion and computation. The result of the intersection of lam*density body with P-impedance body can describe hydrocarbon distribution, which has been proved by drilling.