Abstract：The anchorage and stability of rock mass slopes are the difficult problems in the field of geotechnical engineering. Better calculation methods for anchorage effect in rock mass slope have not been found for a long time. The latent weak interfaces of interlayer in layered rock mass are equivalent to iso-interval collinear in multi-joint model. Based on the linear elastic fracture mechanics，the changes of the stress fields near joint line by anchoring have been analyzed from the finite dimension element of rock mass containing a joint loaded by pressures and shear forces. The formulas of anchor effect by anchoring are proposed and the problems of stability improvement by anchoring in anchored rock mass slope are considered comprehensively.
