Abstract: Since the reform and opening up, with the rapid development of the country's economic construction, more and more engineering projects are located in mountainous areas with complex terrain. Due to the restrictions of site conditions, mountains must be excavated, resulting in geological disasters such as landslides and collapses, which have caused serious construction projects. threat. Loess is mainly distributed in the middle reaches of the yellow river, accounting for 6.3% of the total land area. It forms landforms such as loess beams, loess platforms, et al.,and loess is also prone to geological hazards such as landslides and collapses. This paper discusses the characteristics, influencing factors, stability analysis, choice of management plan, management effect and deformation monitoring of the landslide of the ash dam in a power plant which has recently been investigated, designed and constructed. In order to provide the basis for the management design and construction of similar projects.