Abstract: Mountain slopes often show a state of lateral tension under self-weight load or unloading, and the formation and spreading direction of tensile cracks are closely related to occurrence of rock plane. In order to explore the influence of bedding dip on the tensile mechanical properties and macro-micro fracture characteristics of rock masses, medium-thick layered limestone of the Triassic Daye Formation with 0°, 15°, 30°, 45° °, 60°, 75°, 90° seven dip angles were subjected to Brazil splitting test. By using high-precision three-dimensional laser scanning technology, the rock sample tensile mechanical parameters, linear roughness of fracture surface, and the box dimension changing law with the bedding inclination angle were clarified. The results show that with the increase of bedding angle, the tensile strength and tensile modulus of limestone decrease gradually, and the tensile crack development presents a trend of matrix tension crack, tension-shear composite and weak plane tension. The ultimate failure mode can be divided into straight line, crescent and arc. The linear roughness and box dimension of fracture surface first increase then decrease and increase with the increase of bedding angle. The undulating roughness has a positive correlation with the tensile action of fracture surface and a negative correlation with the shear action of fracture surface. The research results can provide a reference for further study on the internal evolution mechanism of tension failure of layered rock.