Quantifying hillslope soil erosion process will provide an important basis for arrangement of sloping soil and water conservation measures. Thus, a field simulated rainfall experiment was conducted to analyze the effects of freeze-thaw, wind and water agent superposition action on sloping soil erosion in the typical thin mollic thikness region (Binxian county), middle mollic thikness region (Hailun city) and thick mollic thikness region (Keshan county). The experimental treatments included three treatments of only water erosion (I), freeze-thaw + water agent superposition action (Ⅱ) and freeze-thaw + wind + water agent superposition action (Ⅲ). The results showed that compared with the experimental treatment of water erosion only, freeze-thaw action decreased runoff depth in the Binxian, Hailun and Keshan mollic thikness regions by 29.4%, 39.3% and 32.1%, respectively; while it increased water erosion rate by 16.3%, 36.0% and 26.3%, respectively. The freeze-thaw and wind agent superposition actions decreased runoff depth in these three mollic thickness regions by 3.6%, 4.1% and 10.8%, respectively, but it increased water erosion rate by 38.5%, 102.1% and 64.1%, respectively. Under the experimental treatments, both sloping runoff depth and water erosion rates tended to increase from the thick mollic thikness region to the middle mollic thikness region and then to the thin mollic thikness region. The effects of freeze-thaw action and freeze-thaw + wind agent superposition actions on sloping water erosion rate among these three different mollic thickness regions were in orders of Hailun Mollisol > Keshan Mollisol > Binxian Mollisol. The freeze-thaw action reduced soil hardness and soil shear strength by 24.4% ~ 36.7% and 21.3% ~ 23.9%, respectively and increased soil erodibility, thus it increased sloping water erosion rate. The surface wind erosion formed the micro-morphology of wind erosion dent, which enhanced the surface flow concentration and increased flow velocity by 12.4% ~ 19.1%; then runoff depth erosivity and transport capacity were increased, thus sloping water erosion rate increased.