Abstract: By conducting research on the diseases of prestressed concrete continuous rigid frames, evaluating the current situation, and conducting finite element simulation analysis, the applicable conditions and reasonable timing for external prestressed reinforcement of continuous rigid frames were obtained. The applicability conditions for external prestressed reinforcement of continuous rigid frame bridges were proposed, and the conclusions were verified through actual engineering cases. This can provide technical support for the design, construction, and operation management of external prestressed reinforcement of such bridges.