Taking the prestressed concrete cable-stayed bridge of the Huaizhou Tuojiang Bridge as the background, the numerical calculation method was used to analyze the effects of circular prestressing and steel anchor boxes on the load bearing of the concrete pylon wall. The results show that, for medium- and small-span cable-stayed bridges, setting up either a circumferential prestress or a steel anchor box system alone cannot effectively solve the problem of tensile cracking in the concrete pylon wall. However, the combined effect of both systems is better. Additionally, a numerical analysis method is used to calculate the shear lag effect of the π-shaped cross-section main girder with a large cantilever under the completed bridge state, studying the distribution pattern of normal stress in this type of section and providing a reference for the design of similar structures.