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To improve the accuracy of the modeling and stability evaluation of the waste dump, the theoretical analysis is conducted on the remolding load produced by different operation modes of the waste dump. Combined with the compressive deformation characteristics of pore structure, the growth mechanism of shear strength of rock and soil in the remolding process is revealed. Based on the actual production of Shengli Open-pit Mine, this paper puts forward the method of inclined stratification of internal waste dump and horizontal stratification of external waste dump, and analyzes the influence of stratum division on the evaluation result of waste dump stability. The results show that the stability coefficients of the internal and external waste dumps are 6.2% and 30% higher than those of the traditional waste dumps, respectively, and the difference of stratum mechanical parameters results in the overall upward migration of the potentially dangerous slide surface.