Abstarct: The use of steel braces in buildings with a bending seismic system can substantially control the lateral displacement of this system. BRBs by removing the buckling at high pressure have eliminated the problem of conventional braces, but cases such as overweight, high price and rigid performance have led to the introduction of a new type of RLBRB reduced length buckling restraned brace. Effortless. In this research, we introduce an innovative idea called S-core reduced length buckling restraned brace which, despite its short length, can eliminate some of the problems of the BRB system while also acting as a passive control system. Therefore, first the analytical models of RLBRB and BRBs braces in ABAQUS finite element software are validated baxsed on the experimental results of previous researchers.Then, according to the results of the analysis, the characteristics of the S-core reduced length buckling restraned brace are compared with the RLBRB and BRB braces. The results show the improvement of the values of the initial hardness, ductility, strength, and energy dissipation parameters in the S-shaped reduced length buckling restraned brace compared to the BRB brace. Examination of the effect of low-cycle fatigue shows that the proposed brace was able to remain stable without failure until the end of the AISC341 standard loading protocol.