在野外调查和室内分析的基础上，对西南某水电站坝区典型深部差异风化成因和分布规律进行了分析，指出其发育分布均位于微风化和新鲜岩体内部，主要受岩性和断裂控制，成因与河谷及岸坡形成演化密切相关。深部差异风化不会直接影响岩体的稳定性，但将促使浅表生改造进一步发展，导致岩体沿软弱结构面发生松动、变形、破坏、失稳，最终导致边坡的变形、破坏。

On the basis of the field investigation and the indoor analysis， the cause of typically deep differential weathering formation and distribution law existing in some power station dam area of southwest China is analysed. Its developing distribution is located in the inside of the lightly weathered, fresh rock, mainly controlled by lithology and fracture ,and its causes are also closely related to the formation and evolution of the river valley and bank slope. Deep differential weathering would not directly affect the stability of the rock, but it contributes the further development of epigenetic reformation of rock mass, resulting in the loosening, deformation, destruction, instability along the weak structural face of the rock.