Due to sliding mechanism of consequent slope is affected by scale effect. This study investigates scale effect on the gravitational deformation of non-daylight consequent slopes. First of all, a series of centrifuge modeling tests were performed.Then, particle image velocimetry (PIV) was adopted to evaluate the displacement distribution from the results of centrifuge tests. Based on the results of PIV, the relationship between slope deformation and surface settlement was investigated. Subsequently, the discrete element method (DEM) was used for simulations to provide a detailed description of the crack development and failure mechanisms associated with consequent slopes at different scales.To clarify the stability influence of certain dip slopes at different scales. The results of this study are summarized as follows. (1) The consequent slopes exhibit a similar deformation pattern in centrifuge tests. As the gravitational force increases, the magnitude of slope deformation increases significantly; (2) A modified dimensional relationship of material parameters was proposed in DEM simulation. Based on the relationship, the simulated deformed patterns were in strong agreement with the actual deformation at various slope scales; (3) According to DEM simulation, for the slopes with the same slope and weak plane angles, more cracks and displacements generate in the higher slope, leading to a greater sliding volume; (4) Fot the actul case- Chiayi Chaozhou, using the discrete element method to study the sliding, movement that helps to underatand the slope of potential disasters in this region.