Abstract: In this paper, according to the characteristics of bedding slope deformation and buckling failure of slab cracked rock mass in Xinjiang Tianchi Energy South open-pit Coal Mine, with the help of slope radar monitoring means, by transforming the prediction of landslide failure process into the judgment of gradual failure of slope rock mass, the internal relationship between slope radar slope surface displacement rate and slope deformation and buckling failure is analyzed, and based on elastic plate theory, the relationship between slope buckling failure length and anchorage parameters is discussed. The results show that the radar displacement rate of slope surface shows an obvious downward trend in the strong bending uplift stage before the failure of slab cracked rock mass due to the expansion of tension cracks and the exposure of bottom sliding surface; the inflection point at which the radar displacement rate on the slope surface drops to the minimum value can be used as the graphical criterion of slope failure and the time node of critical sliding early warning; when the anchor row spacing is less than the ultimate length of slope buckling failure, the anchor bolt（cable） can effectively improve the flexural stiffness of plate cracked rock mass, and the treatment effect of plate cracked rock mass buckling failure is remarkable.