Abstarct: Considering that corrosion of rebar in reinforced concrete structures is one of the most important reasons for failure in this type of structures and also corrosion of concrete reduces the seismic performance of this type of structures against seismic loads, so we want to see that What is the percentage of rebar corrosion that affects the seismic performance of the structure and then by strengthening it using FRP to increase the resistance of the structure to seismic loads. Therefore, three models of 3, 5 and 8 storey buildings with similar plans and a medium bending frxame system are considered and designed in Appendix software. Then, by modeling them in Appendice software, four forms without corrosion, with 10%, 30% specificity, and FRP-modeled and static analysis of pushover are performed. In this design, the connections are considered as PICHING4. Taken. Reinforcement is also designed using FRP sheets. By examining the results and comparing them with each other, it can be seen that the amount of resistance in the frxames that have corrosion decreases compared to the frxames without corrosion. Also, in the frxame without corrosion, compared to the frxame reinforced with FRP, an increase in strength and hardness can be observed. Also, by observing the results of static analysis of the frxame, it can be concluded that the nature of the columns has a greater effect than the corrosion of the beams on the seismic performance of the structure. Therefore, it can be concluded that columns are more sensitive to corrosion than beams.