【Objective】Soil erosion is serious in the Three Gorges Reservoir area, and green manure mulching can help improve soil structure and enhance erosion resistance. However, the regulation mechanism of green manure on soil erosion resistance is affected by vegetation characteristics and rainfall distribution, and the seasonal response is not clear, Therefore, it is important to clarify the seasonal response characteristics of different mulching treatments on soil erosion resistance, and to screen suitable green manure in the reservoir area.【Method】This study used typical citrus orchards in the Three Gorges Reservoir Area as the research objects and set up three mulching treatments: clear tillage, white clover, and Kentucky bluegrass. The vegetation characteristics, soil physical and chemical properties, and six soil erosion resistance indicators under each treatment were measured in April, June, August, and October. The Comprehensive Soil Erosion Resistance Index (CSRI) was constructed with six erosion resistance indicators to further quantitatively evaluate the influence of different green manure coverages on soil erosion resistance.【Result】The results showed that soil erosion resistance under different mulching treatments showed seasonal variation rules, with the strongest soil erosion resistance in April-June, declining in August under the influence of high temperature and heavy precipitation, and rebounding but not reaching the peak in October. Compared with clean tillage, green manure significantly improved soil physicochemical properties, and CSRI under Kentucky bluegrass and white clover cover was 1.94 and 2.33 times higher than that of clean tillage, respectively. Multivariate statistical analysis showed that CSRI was mainly driven by vegetation characteristics and soil nutrients together, and the key factors were root weight density (RMD), soil total nitrogen (TN) and organic carbon (SOC).【Conclusion】 These results show that green manure mulching significantly improves soil structure and enhances soil erosion resistance, and the effect of Kentucky bluegrass cover is superior to that of white clover.