In order to develop a more practical calculation method of permafrost slope stability

the freeze-thaw fold line slip plane is raised by investigating the permafrost slope sliding examples and analyzing the failure types and its influence factors.The method of fold line slip plane is determined

based on the thermal equilibrium theory and Mohr-Coulomb strength theory.Considering the damage of shear strength under freeze-thaw cycles

seepage on the frozen sliding surface and temperature variation

the stability calculation method of the permafrost slopes supported by frame structures with anchors is given.The results show that the stability coefficient of the permafrost slope calculated by the linear slip surface is smaller than that of the fold line slip plane

which tends to be conservative

and the fold line slip plane is more economical for design.Under the action of freeze-thaw cycle

the stability of the new slope decreases rapidly and will not remain unchanged until 10 years later.Within 10 years after excavation

freeze-thaw cycles play a dominant role in the evolution of slope stability.Temperature increase plays a major role after 10 years.Seepage action has a significant effect on slope stability

but has no effect on the development trend of slope stability.However

all three factors should be considered in engineering design.