Abstract:The gas-bearing sand in Shanxi Formation of Permian of Upper Paleozoic in Eerduosi Basin is a lithologic gas-reservoir which mainly belongs to distributary channel deposit of lake delta plain characterizing low-porosity,low-permeability and high-impedance.It is difficult to differentiate gas-bearing sand from dense sand in lithologic interpretation.It can efficiently differentiate lithology from gas-bearing reservoir in high-impedance horizon and avoid pitfall in seismic lithologic interpretation by introducing AVO analysis method and using AVO-characterized response formed by Poisson's ratio difference of different lithology.Application of hi-fi CDP gather data in AVO processing analysis in exploration and development of Shan-2 gas-bearing reservoir with high-impedance sand in Yulin area of Changqin improved success rate of drilling and achieved good application results.