This paper first introduces the engineering background and characteristics of the equal stress beam technology. Then, according to the upgrading and strengthening project of Dongyang River Bridge, the key technologies in the design of equal stress beam technology are introduced, such as the overall tensioning process, longitudinal tensioning equipment, longitudinal tensioning end, transverse tensioning equipment and devices, and the structure of bending point and bending point of prestressed steel beam. This paper introduces the problems and countermeasures in the construction of the stress beam technology, such as the precise control of the tension stress of the steel beam, the difference between single point tension and double point tension, and the influence of the transverse tension sequence of the first hole on the prestressing effect.