Abstract: Due to engineering construction requirements, a village committee in Qingcheng District, Qingyuan City excavated the foot of a rear hillside, resulting in multiple cracks and deformations at the back edge of the slope. This may trigger geological hazards such as collapse or landslide, posing a serious threat to the lives and property of nearby residents. To evaluate the stability of the slope and take effective control measures accordingly, this study adopts a systematic approach combining field investigation and numerical analysis of rock and soil using Lizheng software.The findings indicate that the slope is primarily composed of completely weathered and highly weathered argillaceous siltstone. Its instability mechanism can be summarized as follows: the cutting work at the front edge of the slope altered the original topography and disrupted the stress equilibrium of the slope. Additionally, during the rainy season, surface runoff infiltrates vertically along the slope surface until it is obstructed at the soil-rock interface, where it then moves horizontally. This leads to a significant reduction in the shear strength at the sliding surface, ultimately triggering an overall slide along the soil-rock interface. Based on this analysis, the mitigation efforts adhered to the fundamental principle of ensuring slope safety while also following the principles of technical feasibility, economic rationality, and functional optimization. A combination of support measures was adopted, including "slope cutting + anchor bolts (cables) + lattice beams + intercepting and drainage + greening." This approach has been successfully applied to the project with satisfactory results, providing a valuable reference for disaster mitigation in similar artificially excavated slopes.