Abstract: A new retaining method for deep excavation flexible retaining method with prestressed anchor has been developed by the authors.The basic composition and the main characteristic of this new method were studied of,and the failure patterns of excavations were described.Based on the limit equilibrium theory,the formular of stability analysis was carried out.Subsequently,deformation and critical sliding zone were analyzed with finite difference method.The calculated results were compared with the soil-nailed support system.Finally,applicability of this new method to practical design works was demonstrated.Its advantages such as small displacements and application to super-deep excavations were investigated.