Abstract: In order to research on the behavior law of mechanical property and failure pattern of rock samples in different stress conditions，rock samples were collected from four in-situ stress measuring points in a certain mine.Afterwards，combining with in-situ stress data，rock mechanics tests in different stress conditions were carried out.The research showed that weak rocks usually shows X-shear failure pattern and hard rock shows extension failure pattern in uniaxial compression test.With the increase of confining pressure，the failure pattern of rock samples changes into oblique-shear failure mode，the peak strength and the residual strength have been increased rapidly，especially，the residual strength grows fastest.Combining on-site stress conditions with mechanical test，it is concluded that the rock-burst in surrounding area of measuring point Wuhkang 1 was most impossible.

Key words: Geostress, Rigid test, Failure pattern, Rock-burst