Considering that the componet of building may be affected by the secondary load when the building under initial load was reinforced in the practical project this paper used CFRP reinforcement method with high performance price ratio to strengthen the building. The numerical simulation analysis of reinforced frame beam was realized by using ANSYS software. The results show that strain along section height under different load levels consistent with the assumption of plane section and the displacement and deformation are in the control range，which can meet the need of engineering design. In this paper the construction operation method is given definitely which make the construction more clearer, more reasonable and well operation.