The soil and water loss underground is of great important and always the neglected part during the process of soil and water loss. The mechanism of soil and water loss underground in karst region involves many fields and has internal relevance with the mechanism of rock-soil-water-organism underground. The study shows that soluble carbonate rock, humid weather, loose and thin soil and fragile vegetation are the main reasons for causing soil and water loss underground in karst region. For soil and water loss underground in karst region, the dual structure of karst environment is the essence; precipitation is the main external force; bilayer structure formed by soil physical properties and carbonate rock is the important factor and vegetation is the key of control.%地下水土流失是水土流失过程中非常重要且常被忽视的部分,喀斯特地下水土流失机理涉及的领域很广,与地下岩-土-水-生物作用机理有着内在的关联性.研究表明,可溶性碳酸盐岩、湿热的气候、松散浅薄的土壤、脆弱的植被是导致喀斯特区地下水土流失的主要因素.喀斯特环境的二元结构是地下水土流失的实质,降雨是水土流失的主要外营力,土壤物理性质与碳酸盐岩构成的双层结构是造成地下水土流失的重要因素,植被是防治喀斯特区地下水土流失的关键.
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