Abstract: In order to study stress and deformation of soil nailing wall in silty clay deep excavation with different design parameters, a whole three-dimensional finite element calculation model was established based on a large scale finite element software ADNIA. The effects of the horizontal space of soil nailing, the soil nailing length, the soil nailing inclination and reinforcement diameter upon the horizontal displacement of the slope and soil nailing axial force were investigated. The calculation results showed that the horizontal displacement of the slope and soil nailing axial force will increase with the growth of soil nailing horizontal space, but decrease until it reaches a certain length as soil nailing length increases, first increase and then decrease with the growth of soil nailing inclination.The effect of reinforcement diameter on the horizontal displacement of the slope and soil nailing axial force is not obvious.