Abstract:To reveal the slope erosion mechanism of coarse texture soil in China, we conducted the indoor rainfall simulation experiments with the four coarse texture soils (sieved soils of TCA, GXA, CTA, WHA from the counties of Tongcheng, Ganxian, Changting and Wuhua, China) to discussed the slope erosion process and sediment particle composition of coarse texture soil. The results showed:(1) The changes of surface runoff characteristics of the soils were significant. The surface runoff increased with the extension of rainfall time, and then decreased and tended to be stable. (2) The erosion characteristics of the soils were different, and the soil erosion rate decreased in the order of WHA>TCA>GXA>CTA. (3) The percentage of grain distribution in erosion sediment of the soils decreased in the order of Clay>Silt>Sand>Gravel. The enrichment ratio of different soils showed obvious difference. (4) There was a significant correlation between water flow power and soil erosion rate, and the relationship between them could be accurately described by power function. The model was more reliable after introducing the soil clay and gravel contents in the expression(Dr=0.001ω1.163Cl-4.069, R2=0.82; Dr=0.003ω1.149Gr-1.934, R2=0.84). The accuracy of predicting soil erosion rate was improved with a wider range of application and more realistic value in practice.