本文通过对碎石桩复合地基的简化．采用有限元方法分析了复合地基的附加应力与桩身应力的分布特征；讨论了桩土应力比与桩土模量比，以及荷载及置换率的相互关系；揭示了桩体变形和复合地基塑性区扩展的基本规律。即从不同角度探讨了复合地基的承力性状。 This paper simplifies the composite foundation of gravel piles. The additional stress of the composite foundation and the stress distribution characteristics of the pile were analyzed using the finite element method. The relationship between the pile-soil stress ratio and the pile-soil modulus ratio, and the relationship between the load and the replacement ratio were discussed. The deformation of the pile and plasticity of the composite foundation were revealed. The basic law of the district expansion. That is, the bearing properties of composite foundations were explored from different perspectives.