The landslide located at the downstream of a hydropower station on the Yellow river is a largescale consequent rock landslide. The data of drilling, cavern, trenching and field investigation shows that the landslide has remarkable characteristics, that are multi zones in plain and multi layers in profile. Based on the viewpoint of dynamical evolution of geological environment system, using the methods of mechanical theory analysis, physical model test and numerical simulation, its formation mechanism and evolution process are analyzed. The landslide formed due to shear between layers of bed rock mass in the slope and bed-burst under the actions of erosion of the river water, earthquakes and so on. The characteristics and evidences show that it slided repeatedly until now and each part has different sliding feature at different phase. Based on the knowledge mentioned as above, the stabilities under current situation of each zone and each layer in the landslide are comprehensively analyzed using many limit equilibrium methods. Combining geological environments where landslide located and their variation features, the develop trend of this landslide is also predicted under the coupled action of atomized rain and earthquake in future.