The purpose of this project is to study the dynamic behavior of a new type of bracing system equipped with knee element. The length and shape of the knee joints strongly affects the dynamic behavior and energy absorption of the braced body of the knee joint. Therefore, more studies are needed on knee element design In this paper, the geometric parameters of the design presented for designing this type of knee brace were re-examined and the optimal values of these parameters were extracted using the genetic algorithm. Then, with the help of the opensees, the behavior of 3, 5, and 7-story steel moment frames equipped with this optimal arrangement of knee elements was used to analyze time histories and incremental dynamic analysis with the behavior of the frames fitted with the proposed arrangement of previous studies. Were compared. The results showed that the ability to tolerate the displacement of optimized samples is more than other samples. Also, the probability of their collapse in these structures is less in the same spectral intensity than those constructed with the proposed arrangement of previous studies.