Various scaled landslide of expansive soil channel slope frequently occurred in the construction of Middle Route Pro-ject of South-to-North Water Diversion, so it is necessary to conduct investigation aiming at the landslide genesis and configu-ration. From the revelation of excavation, it is concluded that the external causes of slope landslide are excavation unloading, co-alescence of fissure, infiltration of rain, creep along gentle direction, and the internal causes are fissures concentration belt, dep-osition interfaces as well as lithology interfaces. The channel slope stability analysis is implemented using rigid limited equilibri-um method and grid search modes considering fissure combination, the calculation results show that the presented slope stability method is reasonable.%南水北调总干渠所涉及的膨胀土渠段出现不同规模的滑坡损害，为此对滑坡形态与成因进行了调查分析。从槽样开挖揭示情况看，卸荷松驰、裂隙贯通、降水下渗软化、沿缓倾角蠕变等是滑坡形成的外因。而缓倾角裂隙密集带、沉积界面和岩性界面等因素构成滑坡的外因。采用刚体极限平衡方法和裂隙组合网格搜索方式，对滑坡实例进行了对比分析，表明所应用的边坡稳定分析模型是合理的。
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