[Objective] The strong dissolvability of carbonate rock leads to the spatial distribution of karst soil and bedrock, and the outcroppings of bedrock are common, but the mechanism of their influence on hydrological processes is still unclear. [Methods] In order to investigate the influence of outcropped bedrock on soil water infiltration, the soil infiltration rate at different distances of outcropped bedrock was measured by single-loop infiltration method, taking the soil 20cm away from the bedrock and 100cm away from the bedrock as the research object, the characteristics of preferential flow were studied by bright blue staining and tracing test. [Results] The capillary porosity and organic matter content of non-ledge soil were significantly higher than those of ledge soil (p < 0.05) , but the soil volume quality was significantly lower (p < 0.05) . The infiltration parameters (initial, stable and average infiltration rate) of non-ledge soil are higher than that of ledge soil. Secondly, the area of staining area and preferential flow path increase with the distance of exposed bedrock. These results indicate that the infiltration capacity and preferential flow frequency of non-ledge soils are stronger than those of ledge soils. Rock surface roughness is an important factor affecting soil water infiltration process, and soil infiltration rate increases with the increase of rock surface roughness, and there is a very significant positive correlation between soil roughness and soil infiltration characteristics (p < 0.01). Kostiakov Model (R2 = 0.89) , Horton Model (R2 = 0.80) and Philip Model (R2 = 0.72) are the best fitting models for soil water infiltration process considering the influence of bedrock outcrop. [Conclusion] Therefore, this study identifies the influence of exposed bedrock on soil infiltration characteristics in KRAS and emphasizes the control role of rock surface roughness.