In order to improve the sliding phenomenon of interval excavation construction of marl slope in highway engineering, the importance of influencing factors of interval excavation is determined by comparative analysis. Firstly, the sliding mechanism of interval excavation is carried out. The analysis mainly optimizes the slope angle, slope height and soil quality of the main influencing factors. Then, using the ABAQUS finite element programs software, the interval excavation process of different soil, slope foot and slope height and the excavation of the slope surface and slope. The plastic deformation zone and displacement of the slope foot was simulated and analyzed. The results showed that the soil strength decreased and the slope height increased within a certain range. The interval excavation size should be reduced. Therefore, in order to avoid mud The problem of soil quality, slope angle and slope height should be considered in the occurrence of the problem of unloading and rainfall caused by limestone slope excavation and the instability of the slope.

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