A series of calculated curves for computing the safety factor of 3D soil slopes are presented here

in light of the analysis process of the 3D limit equilibrium solution to the slope stability is too complex to be widely used. The safety factors of 36864 homogeneous slopes were calculated in advance by using the 3D limit equilibrium solution with a simplified 3D slip surface. And a series of calculated curves were obtained based on these calculation results. According to the curves

the safety factor can be quickly obtained

which is more accurate and reasonable than the 2D analysis. And also the soil strength parameters of the slip surface can be got by back analysis

which overcome the disadvantage that the soil strength parameters obtained by 2D analysis are higher than practical values. The study provides a simple and practical method to the 3D slope stability analysis.