Abstract: Guizhou Province is one of the provinces with typical karst.The Quaternary is widely distributed in the surface of the flat terrain and valley while the thickness variates strongly.The soil is infertile and the soil erosion is serious,which leads to the rapid rock desertification and fragile ecological environment in this region.Takes the small hydrogeological unit in Chenqibao village of Puding Country as an example,there are sampled soil on typical test points,and then,did field and indoor tes...