Abstract: Currently, mainly based on the designers experience, the piles row distance of the cantilever doublerow piles is designed. The failure mode of the cantilever doublerow piles that affects of the piles row distance is proposed. On the basis of the soil arch theory and the limit equilibrium theory, the formulas of the piles row distance are derived, and the calculation method of piles row distance is proposed. Finally, by using this calculation method, the piles row distance of the cantilever doublerow piles on a certain landslide is calculated.