½éÉÜ£º Abstract£ºAt present£¬the methods of analyzing the stability of slope under earthquake are not accurate and reasonable because of some limitations£®Based on the real dynamic tensile¡ªshear failure mechanism of slope £®the paper proposes dynmnic analysis of strength reduction FEM (finite element method )and takes the reduction of shear strength parameters and tensile strength param eters into consideration£®And it comprehensively takes the transfixion of the failure surface£¬the non¡ªconvergence of calculation and mutation of displacement as the criterion of dynamic instabihty and failure of the slope£®The stYength reduction factor under limit state is regarded as the dynamic safety factor ofthe slope under earthquake efect and its advantages are introduced£®Finally£¬the method is applied in the seismic design of anchors supporting and anti¡¤slide pile supporting of the slope£®Calculation exam ples show that the application of dynamic analysis of strength reduction is feasible in the seismic design of slope engineering£¬which can consider dynamic interaction of supporting structure and rock¡ªsoil mass£®Owing to its preciseness and great advantages£¬it is a new method in the seismic design of slope supporting