Abstract: In the past five years,China has experienced more than 20 earthquakes of magnitude 6 or above. These events are often accompanied by frequent aftershocks and intermittent heavy rainfall,leading to severe seismic and geological disasters. To investigate slope damage evolution under combined earthquake and rainfall effects,a 1/130-scale model slope was designed based on the 2021 Yangbi earthquake in Yunnan. The acceleration,resistivity,and moisture content of the slope under intermittent seismic loading and rainfall were monitored. The relationship between resistivity,moisture content,and soil damage was used to analyze the slope damage evolution. The results show that under seismic action,initial cracks form on the slope surface,and the damaged zone provides preferential paths for rainwater infiltration. After repeated cycles of earthquake and rainfall,the peak ground acceleration(PGA)amplification and surface effect increase by approximately 1.7 times. Cracks propagate deeper due to vibration,and soil strength continuously decreases due to rainfall infiltration. Consequently,slope damage progresses from the surface to deeper layers. With ongoing damage development,a continuous sliding surface may eventually form,leading to overall slope instability. These findings provide a reference for slope stability research under combined seismic and rainfall conditions.