Abstract: The difference exists in the orientation between the local stress and regional stress.So it is not proper to define the regional stress direction as the local stress direction.According to mechanical decomposable characteristics, the local stress direction is defined as the component of the regional stress direction along the contour line in this paper.Based on this method, the local stress orientation of well Slin Beibuwan basin is NNW-SSE and SWW-NEE.This local stress orientation is consistent with that analyzed by imaging logging.So the novel method proposed in this paper is feasible and can be popularized in this region.