Ordinary constitutive models of soils cannot reflect the initial stress state of soil and the stress path of excavation, so that the displacements of characteristic points obtained from the finite element calculation may deviate from the actual magnitudesIn this study, the modified OhtaSechiguchi anisotropic elastoplastic model, which can reasonably describe the initial K0 stress state of soil before slope excavation and stress path of excavation, is chosen to calculate the excavation slopeAccording to the criterion of displacement mutation, singlefactor sensitivity analyses of 54 simple slopes are carried out by finite element method, and the basic parameters positively and negatively correlated with the slope displacement are obtainedFor the first time, the basic parameters of soil slope such as geometric parameters, physical parameters and constitutive models are considered at the same time through the gray correlation analysis methodBy normalizing the slope deformation, the normalized instability criterion Fu and the warning displacement value U′1 are constructed on the basis of displacement magnitudeConsequently, the safety evaluation of the landslide mass can be performed timely by real-time monitoring of the slope displacement.