Abstract: Researching on rock slope stability, the rock mass must be studied first.Rock mass is complex geological body, which composed of rock and discontinuities.The rock slide of rock bridge is a main type of large rock slide.For such slopes, rock bridges have key influence on the stability of the slopes.When the stability of the slope is analyzed, the overall stability of the rock mass can be simplified to analyze the stability of rock bridge.To reinforce the rock bridge section can ensure the safety and stability of the whole project.In the background of Washan open-pit mine, search and confirm the rock bridge of slope, and analyze the energy distribution and carrying capacity of the rock bridge.The mainly acting energy was determined as potential energy, blasting vibration energy, fractured dissipative energy, friction dissipative energy and kinetic energy of instability.Each part of energy was obtained by different theory or test.These results are of great significance for the stability evaluation and hazard control of such landslides.