Abstract: To solve the bottlenecks of He-3 sandstone reservoirs of Sulige Gas Field, such as thin thickness and small differential of wave impedance of effective reservoirs and enclosing rock, the prestack inversion and AVO property analysis technologies are adopted to acquire the elastic parameters of reservoirs after the sensitive parameters of reservoirs are determined by logging petrophysical analysis, thus predicting the lithological characters, physical properties and gas-bearing characteristics of reservoirs. The study indicates that the horizontal wave impedance and Poisson?s ratio of this zone can be used to effectively identify the lithological characters. The intersection point of vertical wave impedance and Poisson?s ratio and the intersection point of elastic impedance of different angles can be used to predict the gas-bearing properties of reservoir, improving the accuracy of reservoir prediction and success rate of drilling wells.