Based on the elastic differential equation of flexural slumping rock layer in layered dip rocky slope and its accurate solution, the critical length expression of flexural slumping rock layer is established with energy method; and the major influencing factors are summarized and their first and secondary relationships are analyzed through predominance analysis.

Through the collection of systemic references and great amounts of location investigation,it is found that there is another typical form of deformation and failure for steep bedding rock slope,namely,toppling deformation.