Abstract: By using the tri axial stress testing instruments, and simulating the production process in different formation conditions, vast amount of core tests are conducted to try to discover the influencing tendency of such factors as formation pore pressure and oil contained water saturation on rock characteristics, with the help of statistic theory. A dynamic model is established for calculating the rock mechanics characteristics in specified formation conditions. Testing results show that the correlations between Young’s modulus, compressing strength, Biot coefficient and the effective surrounding pressure are all of power law exponent; while the correlations between that of Young’s modulus, compressing strength and water saturation are all of logarithm. This study sets a foundation for predicting the changing tendency of rock mechanics characteristics in oil production.