Abstract：The time-dependent behavior of rock mass is one of the important factors that influence the deformation and long-term stability of the slope. As an engineering example，Maya high slope is studied，which is located at the Shuibuya dam site on the Qingjiang River，with alternatively distributed soft and hard rock layers. The creep failure characteristics of different soft/hard rocks are studied through laboratory compressive-creep tests. Then，the rock rheological constitutive model is established；and the parameters are identified accordingly. With these understandings，the time-dependent behavior and the stability of the Maya slope are analyzed by using 3D viscoelastic-plastic numerical method. The results show that the time-dependency effect is very remarkable. As for the high rock slope with large-scale excavations，the creep characteristics influence the quantity of the displacement and change its direction. In the long-term running process of the engineering，the changes of the stress field induced by the rock creep will cause the plastic zone to extend from slope surface to the inward；and the extending range could stretch dozens of meters for ten years.
