Large landslides and landslide group are characterized as large size, complicated formation mechanism, many indu-cing factors, serious damaging, difficult in harnessing and so on. Shagong Ancient Landslide by Sichuan-Tibet Highway is a typical loose accumulational landslide. This paper describes the geographic location, topography characteristics, features of geo-logical environment and landslides in detail based on field survey data. Through the analysis on its motion characteristics, failure modes, it is determined that the ancient landslides are retrogressive one. The results showed that the coupling of fragile geological structure composed of moraine loose overburden and sandstone, the tectonic activity and water-rock interaction are the main cau-ses of the formation, which is important for landslide treatment.%大型滑坡及滑坡群具有体积规模大，形成机制复杂、诱发因素多、危害影响严重、治理难度大等特点。川藏公路沙贡特大古滑坡群属于典型的松散堆积层滑坡，基于现场详细勘察资料，对其地理位置、地形地貌特征、地质环境及滑坡群特征进行了介绍，通过分析其运动特点、破坏形式，判定该特大古滑坡群属于牵引式滑坡。研究表明：冰碛松散覆盖层与砂岩组成的脆弱地质结构、地质构造活动以及水与岩土体相互作用三者耦合是沙贡特大古滑坡群形成的主要原因，其成果对滑坡治理具有指导意义。
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