Using shaking table tests,we studied four layered slopes with different overburdened soils by increasing the horizontal sine acceleration time history as the input to analyze the impact of the thickness of the overburdened soils on the stability of the layered slopes.The failure position,property,pattern,and disadvantageous thickness of the overburdened soil were thoroughly investigated,and the relationship between the slope magnifying effect and the altitude was verified.A mode analysis was conducted for the test model using MIDAS/GTS to study the relationship between the self-vibration frequency and the thickness of the overburdened soil.The test results indicated the following:(1)The first failure plane was observed in the middle and the upper parts of the slope where the maximum response was found to be in the model slope in the case ofthe 6-cm-thick overburdened soil.(2)The failure patterns were different for the slopes with different thicknesses of the overburdened soil.In the case of the slope of a relatively thick overburdened soil,the fissures occurred first on the higher part of the slope and kept spreading until the entire slope collapsed in the avalanche mode.(3)With an increase in the altitude,the peak acceleration tended to increase as well,but the maximum value was observed in the middle and the upper parts instead of at the crest of the slope,which implied that the altitude magnifying effect occurred not only in the homogenous slope but also in the layered slope.