Abstract: Based on elastoplastic theory and a practical project case of prestressed anchor-cable with reinforced slab for strengthening the retaining walls of railway subgrade shoulders, a method is proposed to calculate the anchor-cable length under the condition that cohesion shearing stress is non-uniformly distributed. The stability of the project is analyzed by taking the slab as a beam, and the slabs are designed according to the stresses in the interfaces between the wall, the cement and the reinforcement. The proposed method has been applied in engineering practice with satisfactory outputs.