The effects on soil erosion by soil physical properties under different utilization types in Guizhou karst mountainous region were studied, the results showed that soil physical properties are internal factors on soil erosion and anti-erodibility, the karst mountainous soils are outstandingly characterized by sheleton soil in Guizhou province. The soil physical properties were greatly different under various land utilization types, the soil physical properties were very good in the wood lands, grasslands and cultivated-terrace lands, and reduced occurrence of soil erosion, but the soil physical properties were bad and difficiently favourable in agro-cultivated slope land and bare slope land. By comparison analysis, the main indexes of revaluating karst mountainous soil anti-erodibility were put forward. The soil anti-erodibility in various land utilization types was cultivated terrace land>wood land, grass land>cultivated slope land and bare slope land. The main site of soil and water loss was cultivated and bare slope lands in Guizhou karst mountainous region.