Abstract: Rock deformation and failure can be regarded as the process of energy dissipation and release. This paper conducts the laboratory test on rocks s samples from Xirangpo banks of Badong town. The rock energy dissipation characteristics of the middle triassi badong formation are analyzed. Furthermore, the paper analyzes the laws of rock energy and discusses the strength characteristics and the failure regularity of bank slope. The paper indicates the follows. (1) By compression test, failure mode of rock can be divided into four categories. The wedge shear and tensile failure modes have the largest energy consumption rates. The mode of shear failure along weakness face owns the smallest one. (2) the hardness of rock can be characterized by energy of external load input before peak, rock failure and damage energy and unit length of the crack energy consumption rate. The hardness distributes unevenly vertically. The internal part of rock is easy to occur bedding slip under tectonic effects. (3) High strength rock usually performance brittle failure. The failure energy consumption speed is fast before the damage. Hard rock slopes normally concentrate a large number of elastic energy which is much larger than the required energy for rock failure in destruction stage, leading to severe sliding. (4) At the areas of mineral composition changes in rocks, the indicators of rock energy analysis have shown apparent fluctuation. Strength of lime rock is relative higher than clay rock. The results can provide an important reference for interpreting the mechanics character of rock and failure mode of landslides in Badong town.