The effects of effective pressure and lithology on Biot's coefficient and rock elastic moduli were analyzed through experimental testing at simulated in-situ conditions(including temperature

and confining pressure) upon 87 samples of sandstone from the Palaeogene formation in Jiyang Sag and by combining with the core thin-section analysis results.It is concluded that Biot's coefficient decreases as effective pressure and calcite cement content grow and increases with the increase of rock porosity

while rock elastic moduli become bigger as the effective pressure gets stronger.A Biot's coefficient model and a relational model between rock elastic moduli and porosity are built.The upper limits of bulk modulus or compressional velocity calculated through the mo-dels are closer to the measurements of samples

proving that the model may yield more logical parameters for oil field development.