Based on the drainage project in the flight area of Beijing New Airport, the theoretical analysis, finite element simulations and laboratory model tests were carried out on the influence of the stability of the slope which was protected by geocell on its surface. In this paper, we studied the deformation laws of slope soil, the overall stability of slope soil and the erosion effect of slopes under different gradients in the cases where the slope surface was protected by geocell or not. The

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... ts show that after the geocell is installed, the pore water pressure of the slope soil is significantly reduced, and the cohesion and friction between the soil particles are indirectly increased. Besides, the restraining effect of the geocell on the topsoil can significantly reduce the maximum plastic deformation of the slope soil, reducing the maximum displacement of the slope soil by about one third. Lastly, the anti-erosion effect of geocell is more obvious after the slope gradient exceeds 1:1.5, and is most significant when it reaches 1:1.25. However, when the slope gradient reaches 1:1, this effect will decrease.