[Objective] The experimental studied runoff yield, sediment yield and runoff hydrodynamic parameters during erosion process of red soil slope in order to provide the basis for revealing the mechanism of slope erosion and sediment yield on red soil slope.[Methods] Red soil was used, a total of 18 rainfall simulation experiments were conducted in a 8.0 m long drainable flume, with treatments including three levels of typical slope gradients (6°, 10°,15°) and three rainfall intensities (120, 180, 240 mm/h). The processes of runoff generation, sediment yielding, and runoff hydrodynamic characteristics variation were analyzed.[Results] The accumulative runoff and sediment load significantly increased with the increasing of rainfall intensity under the same slope gradient. The runoff rate variation showed a steady state after an initial increased fluctuation. The sediment yield rate increased with the increases of both rainfall intensity and slope gradient. The sediment generation process showed a variation that increased rapidly at the beginning and decreased quickly with the experiment time passed. There was a good exponent relationship between Froude numbers and Reynolds numbers, while flow Darcy-Weisbach friction coefficients and Reynolds numbers had no obvious correlation.[Conclusion] There is a significant correlation between runoff hydrodynamic parameters and erosion sediment yield. By comparison, Reynolds number of runoff is the most closely related to slope erosion sediment yield.