seismic retrofit strategies have been developed in the past few decades following the introduction of new seismic provisions and the availability of advanced materials and methods. it can be observed that new approaches to deal with more lateral forces are more innovative and more energy absorbent. in line with this, there is a growing trend toward the use of steel shear walls as a system with too much energy dissipation, low weight, and compatible architecture.this study has evaluated some lateral forces resisting systems (lfrs) for retrofitting of steel buildings specially slit steel panels as an effective and economical method. the main concept of these panels is for the steel plate between the slits to behave as a series of bending links, which undergo big ?exural deformations relative to their shear deformation. each flexural link can be examined independently from one another, and its behaviour can be approximated to a double curvature column in the sense that each flexural link develops plastic hinges at the ends. some models in abaqus were conducted. the observations indicate that without changing the property of panel (i.e., material or dimensions), stiffness and strength can be finely-tuned by changing the geometric parameter. this thesis focuses on achieving the proper region for determining the geometry factors; in addition to brilliant design to obtain the acceptable responses in slitted shear walls.