This article adopts the general finite element analysis software——ANSYS to do the numerical analysis and research on some Composite Soil Nailing. The Drucker-Prager model modified with depth was adopted as the constitutive model. The article presents a lot of numerical calculations and analysis, researching the effects of excavation order, nailing length and nailing obliquity to the horizontal displacement of foundation wall, surface sedimentation and rise of the foundation bottom, giving some useful conclusion which can be used as the references to the design and construction of foundation supported with Composite Soil Nailing.