The conventional beam-spring FEM used in deep excavation retaining design is based on anchored pile or anchored diaphragm retaining; and it is not fit for prestressed anchor flexible retaining wall. Based on the construction characteristics of prestressed anchor flexible retaining wall

the beam-spring FEM is modified. A new technique to evaluate the excavating load for flexible retaining is given; and a new beam-spring FEM program is developed correspondingly. Lastly a practical engineering project is analyzed using the new beam-spring FEM code. The horizontal displacement of retaining wall and the axial force of each anchor are yielded and compared with the field data; and it is shown that the new beam-spring FEM suits prestressed anchor flexible retaining wall.