A model based on limit equilibrium analysis of rigid body with double sliding plane for calculating rock slope stability is proposed in the paper.The influences of hydraulic pressure and earthquake load are considered.The anchorage research is carried out.The sensitivity analysis of mechanical parameters of structural plane is analyzed.It is shown that the hydraulic pressure is the most important effect to the failure of slope and the effect of earthquake load is also remarkable.The rock slope is safe on condition that the total anchoring force is enhanced to 2 920 kN.Moreover

both anchorage effect and economic benefits are achieved when the anchoring angle is 25°.The parameter φ1is independent of the slope stability

but the parameters of c1、c2and φ2which are improved are helpful and in a increasing order.However

the influence grade is small.The obtained results can offer criteria to improve the practicial construction of engineering.