This paper takes the high-slope project of a newly built urban road in Hunan Province as the research object and systematically analyzes its geological conditions, hydrological characteristics, and slope stability issues. In response to the characteristics of high fill slope height (9–17.3 m) and high safety level (Level I), a comprehensive treatment plan was proposed, incorporating “anchored pile-sheet retaining walls, slope ratio method, interception and drainage, and greening protection”. The paper elaborates on the design of the support structure, construction techniques, quality control, and deformation monitoring, with a particular focus on discussing the collaborative working mechanism between prestressed anchor cables and anti-slide piles, the timing control of layered filling and anchor cable tensioning, as well as the information-based construction and emergency response mechanisms. Research indicates that this plan demonstrates good applicability and safety under complex geological conditions and limited slope relaxation, providing a technical reference for similar high-slope projects.