Seasonal changes in soil erosion and redistribution on a long gentle hillslope in China's Mollisol region were studied using a multi-tracer method with rare earth elements. Snowmelt runoff, wind, and rainfall-runoff were identified as key erosive forces. The study found that surface runoff was the main cause of soil erosion, accounting for almost 90% of total annual soil loss. Snowmelt runoff and rainfall-runoff erosion were responsible for significant sediment transport ratios along the hillslope segments. Overall, the research provides valuable insights into the seasonal patterns of soil erosion on long hillslopes.