Abstract: Considering the typical material composition of accumulated deposit landslides in the Three Gorges Reservoir area, landslide models were created using a mixture of cohesive soil and sand as the sliding medium, with artificially introduced weak sliding surfaces. The study investigates the stress distribution, deformation, and moment distribution patterns of the ecological-supportive joint protection system during the deformation process induced by rainfall infiltration-triggered landslides. It also examines changes in the slope seepage field to elucidate the stress allocation mode between surface-level ecological vegetation protection structures and deep-seated anti-sliding pile support structures. Under continuous rainfall conditions with a duration of 8 hours and an intensity of 18 mm/h, ecological slopes protected by the joint protection system of ecological-supportive structures reached overall saturation later compared to pure pile slopes protected solely by anti-sliding piles. The vegetation interception and "film" drainage effect on the slope surface weakened rainfall infiltration, thereby delaying slope deformation. Increased pore water pressure near the slip surface and reduced mechanical properties of the slip surface were identified as the dominant factors causing slope deformation (manifested as pile-top displacement and pile bending moments) in the later stages of rainfall. The final displacement of the pile top in pure pile slopes was significantly greater than that in ecological slopes protected by anti-sliding piles. Moreover, the maximum bending moment in ecological slopes was significantly reduced compared to that in pure pile slopes, indicating that slope vegetation mitigated part of the sliding forces induced by rainfall and formed a dual protection mechanism with deep-seated anti-sliding pile structures, thereby enhancing overall slope stability. In extreme rainfall erosion experiments, the tolerance and failure mechanisms of the two types of slopes differed: pure pile slopes experienced complete failure after 60 minutes, exhibiting localized shallow sliding failures caused by torrential rain erosion, while ecological slopes experienced partial failure after 150 minutes, manifested as collapse failures in the lower part of the slope.