抗滑桩最大桩间距确定的基础理论至今未建立起来，工程实践中仍依赖专家经验。本文从方桩桩间土拱形成的原理、力学特性论证入手，较全面地分析了桩间土拱的受力、变形，力的传递和土拱破坏瞬间的最大桩间距。并建立了最大桩间距平面计算模型。

Anti-sliding pile has been used for prevention and cure landslide more than 40 year , but the radical theory to decide the max distance of one another pile hasn' t been set up to now , and the suitable distance of one another depend mostly on expert' s experience to decide in work. The paper start from the principle and the mechanical characteristic of forming soil arch of square pile , and analysis roundly the power and the deformation and of soil arch between two antisliding pile , and the instant most distance between two piles when soil arch is been destroyed as well as , also set up the plane model to decide the suitable distance between two piles .