The Bonan oilfield，developing large low permeability reservoirs，suffers serious water flood after fracturing because of its poor reservoir property and not considering the influence of current stress during exploitation. It is necessary to research the distribution of current stress systematically in the further development. Taking the Es3 of the 5th block of Bonan oilfield as an example，the current stress for the Es3 of the 5th block of Bonan oilfield and its direction were identified by means of laboratory core test method，such as differential strain method，acoustic emission method and velocity anisotropy method；and the relationship between dynamic and static rock mechanical parameters was established by logging data interpretation. The relationship between rock dynamic and static mechanical transformation parameters was extracted through logging data interpretation to pick up accurately rock mechanical parameters and establish the geologic model，and then the stress distribution characteristics and influence factors were analyzed combining with the finite element numerical simulation. The result shows that the current terrestrial stress exists regionally in the 5th block of Bonan oilfield. The maximum horizontal principal stress direction is N61.4°E in the east and S58°E in the west. The maximum horizontal principal stress is low at the center，high in the boundaries with a ring-shaped distribution pattern. The minimum horizontal principal stress decreases from north to south. The regional stress is higher in the study center. The abnormal direction of in-situ stress is mainly resulted from symmetric lateral shear forces which are formed when the V-shaped fracture system is squeezed by nearly east-west stress. The section stress is mainly influenced by depth and mechanical parameters.