Abstract: It presents results of detailed investigation and drilling at the landslide. The results indicate that the special loess provides the material foundation for the formation of the landslide. Secondly, the slope relief, consequent slope structure, loess joints and so on provide the boundary conditions for the landslide instability. Next, human activities and precipitation and so on are the predominant e inducing factors for the instability. The various factors are complement to each other to lead to the development and taking place of the landslide. Based on the above results，this paper uses the SARMA and FLAC methods to calculate and simulate the stability extent of the landslide. The analysis of soil body stress and calculation o the factor of safety factor for the landslide show that although the landslide is in a stable state as a whole, there is the possibility for a partial instability of landslide at the left side of front edge. This analysis result is basically in accordance to the result of the field investigation result . But, in the saturated state, the natural and seismic state, the saturated and seismic state, the probability for a whole instability of the landslide is high.