Abstract: The Biot coefficient has an important application value on the drilling engineering fracturing engineering.The equation, which is used for the log interpretation of Biot coefficient, is dependent on all-wave logging,so its spread is limited. Based on the results of core tests,taking the deformation mechanism of grain-rock and chemical crystallized rock,the interpretation method for Biot coefficient is presented utilizing the broad sense Usher model, and the profiles of rock mechanics and in-situ stress parameters calculated by this model are coincident with the drilling data based on the log data. That means, this model is valuable for spreading application.