Abstract: Based on the nonlinear finite element software ADINA,the construction process of excavation and supporting of the composite soil nailed wall of soil nailing and cement-soil piles for deep foundation excavation is simulated by a whole three-dimensional finite element model.Spatial action of foundation pit was considered in the model.The deficiencies of two-dimensional plane model or a partial spatial one were overcomed.Whole displacement of foundation,the horizontal displacement of excavation fac...