Abstract：The slope movement is a complex and dynamic process，especially the slope of the reservoir banks. During the moving process of reservoir slope，huge surge usually appears with it and has a great effect on it，so it is more difficult to describe the moving process of this kind of slope movement numerically than the others. Based on the rebuilt 3D geological model of slope of the reservoir banks，the mechanism of instability is analyzed by using 3D limit equilibrium method firstly，which provides an environmental background for the visual simulation. Then，in the case that the reservoir slope may be instable，the flow chart for digital and visual dynamic simulation of its movement is presented，according to the special features of two stages of the reservoir slope motion process，i. e. movement on ground and movement below water level. Finally，the whole process of reservoir slope movement is unified and its 3D visual dynamic expression is realized. The outcome of the application to an example gives a visual description of the slope motion process and the surge undulation at the same time，which demonstrates the feasibility and practicability of this method. Thereby it supplies a more convenient and visual analysis means for the research of slope motion process.
