Luhun irrigation area has been in operation for more than 10 years, and has played a huge role in the drought resistance struggle in western Yuxi, due to mass construction, the accident rate during operation is high, especially the hundreds of filled dams in the irrigation area, and the original construction quality is poor. Aiming at the local stability problem of the filled dam, the finite element method was used to calculate the seepage elements of various schemes, as well as the critical slope drop value under the condition of slope free infiltration and slope inundation, and the local stability of the filled dam was analyzed, and it was concluded that it could basically not meet the local stability requirements, mainly due to: poor construction quality, insufficient dam compactness, many cracks and penetration, so that the seepage flow rate and hydraulic slope were large, and the slope soil was washed up and unstable. The solution is to increase the compactness of the dam body through grouting and other measures, and add a filter layer or thicken the dam surface.