The current work investigated the Seismic behavior of a combined bamboo grid and bamboo nailed (CBGN) reinforced slope, which utilized 2D numerical analyses using the finite element program through Midas GTS NX 2024 v1.1 software. For this investigation, the 1971 San Fernado Down earthquake records are used in the nonlinear time history analysis of the slope. A comparison was made to analyze the lateral displacement and settlement of different slope parts. The combined bamboo grid and bamboo nailed (CBGN) slope analysis reveals that the most significant horizontal displacement occurs at the slope’s face, with the crest and base showing less deformation. Time-dependent displacement varies notably within the first 10 s, particularly at the slope’s top and bottom faces, indicating high sensitivity to ground motion. Reinforcements like bamboo grids and nails influence stability, reducing vertical displacement and strain, especially at the slope’s face. The crest experiences complex displacement and settlement patterns, while the toe shows more stability. Stress analysis shows a shift from compressive to tensile forces in the reinforced slope, with the highest compressive stress at the top and tensile stress at the base. Overall, these findings highlight the critical role of reinforcements in enhancing slope stability and mitigating displacement, especially during the seismic stress application phase.