High filling and excavation of loess landslide happens more frequently, which serious impact on security of the project, but formation mechanism of the landslide is still not perfect, therefore this paper analyze from damage characteristics and influence factors of slope stability to evaluate its stability and summary such failure mode. Conclusion: ① The root cause of the formation of class landslide: the lithology of compacted layer is different from upper loose soil, and the clay is unevenly distributed, which lead to local shear strength lower ② Rainfall is the main predisposing factors of slope instability, which infiltrates slope, the weak surface throughout the entire slope.③ Failure mode is similar to the general loess landslide, but the position of slipping surface is more regular