In railway construction, operation and maintenance, due to the influence of engineering geological factors, natural and construction activities and other factors, the safety of high cutting slope is one of the main key concerns of railway engineering. For the long-term stability of railway roadbed slope,based on the slope safety factor and deformation relationship, long-term strength of rock and soil, and tempo relationship, this paper established the safety factor of slope, shear deformation and time relation model, proposed three cut high slope stability evaluation index, including the long-term stability safety coefficient, the exponential value of deformation rate and the index of limit,and four-level and eight-level early warning schemes for high slope safety and stability,specified the emergency treatment measures which should be taken under different early warning levels.Through the actual engineering monitoring data, the instantaneous stability safety factor, long-term stability safety factor and long-term cumulative deformation state of high railway cut slope were systematically analyzed, and the risk warning classification of the high cut slope was determined.