【Objective】Soil erosion in the Three Gorges Reservoir Area is severe. Covering with green manure helps improve soil structure and enhance erosion resistance. However, the regulatory mechanism of green manure on soil erosion resistance is influenced by factors such as vegetation characteristics and rainfall distribution, and the seasonal response is still unclear. Clarifying the seasonal response characteristics of different covering treatments on soil erosion resistance is of great significance for screening suitable green manure in reservoir areas. 【Method】Based on this, this study took typical citrus orchards in the Three Gorges Reservoir Area as the 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. A Comprehensive Soil Erosion Resistance Index (CSRI) was constructed to quantitatively evaluate the impact of different coverings on soil erosion resistance. 【Result】The results show that the soil erosion resistance under different covering treatments presents a distinct seasonal variation pattern. The soil erosion resistance is the strongest from April to June. Affected by high temperature and heavy precipitation in August, the erosion resistance decreases. It rebounds in October but does not reach the peak. Compared with tillage, green manure significantly improves the physical and chemical properties of the soil. The CSRI under the coverage of Kentucky bluegrass and white clover is 1.94 times and 2.33 times that of tillage, respectively. Multivariate statistical analysis indicates that CSRI is mainly driven by both vegetation characteristics and soil nutrients, with the key factors being root density (RWD), total soil nitrogen (TN), and organic carbon (SOC). 【Conclusion】Green manure mulching can significantly improve soil quality and erosion resistance, among which the mulching effect of Kentucky bluegrass is superior to that of white clover.