In order to solve the problems of many anchorage devices, complicated structure, expensive cost and easy to damage beams in the upgrading and strengthening of prestressed concrete simple-variable-continuous girder bridges with deep strand joints, Xing Xianjun, a senior engineer of Hebei Provincial Institute of Transportation Planning and Design, put forward the idea of "equal-stress beam technology". This paper introduces the design and implementation method of prestressing equal stress beams in the reinforcement project of Dongyang River Bridge, pointing out that the equal stress beam reinforcement method can effectively save prestressing steel, reduce the amount of anchorage, and is very favorable to the overall structural stress of the bridge.