Abstract: Anti-slide pile is a major landslide preventionmeasure. This paper analyzes the transition process of force between soiland anti-slide pile based on force equilibrium.According to the relationship of acting force and reacting forcebetween soil and anti-slide pile, the stress distribution in the soil behind anti-slide pile is obtained.From the stress isograms, it is shown that the mechanism of soilarc between anti-slide pile and soil is the result of the stress statefrom imbalance to balance in soil.