Abstract: In this paper，the research background is the sudden landslide of the slope with goafs in a certain mine is studied.In order to find out the causes of the landslide，predict the stability of the slope，explore the mechanism of the landslide and the effect of goafs on the stability of the slope.FLAC and Geo-Slope software are used for numerical simulation in this paper.Combined with the field displacement monitoring data to comprehensively judge the stability state of the slope，and analyze the mechanism of the landslide and the effect of goafs on the slope.The results show that the slope is in a stable state，but in the later excavation process，the slope near the railway platform may be local landslide，which needs the key treatment.Relatively broken rock mass in the upper slope，and the interference of external factors such as rain infiltration and blasting vibration is the main cause of the landslide.Goafs have no influence on the stability of the slope.