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As a common method, external prestressing widely informs rehabilitation in existing structures. This paper presents the total prebending moment calculation of external prestressing with different tendon profiles. Meanwhile, the external prestressing loss and original internal prestressing loss are considered in the calculation in both the theoretical method and the finite element method. Then, we discuss the reinforcement efficiency of different tendons profiles and provide the reinforcement distribution ratio. The results show that the theoretical method is similar to the finite element method, and it can quickly evaluate the reinforcement effect by using different tendon profiles in engineering. By comparing the reinforcement efficiency under different external tendon profiles, the reinforcement scheme is determined according to the local damage and the overall damage of the beam, which effectively decreases the cost of reinforcement.