By using the geotechnical engineering experimental method and classification criteria, it is analyzea me granite weathering mantle in the collapse hill area. The results show that, 1 ） the weathering crust can be classified as diluvial layer and weathering rock - soil layer in accordance with the geologic origin and weathering degree. Of which, the weathering rock - soil layer is divided into residual soil layer, completely weathering layer and strong weathered layer with the high contents of clay and quartz and high contents of silt and feldspar as their typical features respective- ly ; 2） on the basis of the soil granulometric composition, plasticity index and the mineral constituent of the particle, the rock - soil of the weathering crust may be classified as six categories, that are cohesive soil, quartz gravel, silt, dust silt, feldspar gravel and breccia, with the corresponding weathering crusts of diluvial layer, residual soil layer, completely weathering layer, top of strong weathered layer, middle of strong weathered layer and bottom of strong weathered layer, respectively; and 3 ） the characteristics of the diluvial layer and weathering rock - soil layer have great variation with obvious limit, while the characteristics in the different layers of the weathering rock - soil layer appear the gradual transitional relationships.%本文应用岩土工程的试验方法及其分类标准，对崩岗发生区的风化壳岩土进行分析。结果表明：①依据地质成因和风化程度，风化壳可划分为坡积层和风化岩土层，其中，风化岩土层又分为残积土层、全风化层、强风化层，并以粘、石英含量高、粉、长石含量高分别为各自的典型特征。②依据土的颗粒组成、塑性指数、颗粒的矿物组成，可将风化壳的岩土分为六大类：粘性土、石英砾砂、粉土类、粉砂、长石砾砂和角砾；且对应的风化壳层次分别为坡积层、残积土层、全风化层、强风化层上部、强风化层中部、强风化层底部。③坡积层与风化岩土层的性质变化大，界限明显；风化岩土层中各层次之间为渐变过渡关系。
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