Abstract: To determine the anchorage depth for rigid anti-slide piles, a reliability analysis model is established based on the strength reduction finite element method. The target reliability index is selected according to the classification of slope engineering, and the design of the anchorage depth of anti-slide piles is guided by the target reliability index. Through the analysis of a practical project, the effects of the variation of soil layer parameters on the anchorage depth are studied. The main influence parameters are determined. It is shown that using the reliability analysis method to determine the anchorage depth for rigid anti-slide piles is rational and useful for engineering applications.