In this study, the seismic performance of the improved structures against progressive failure under the influence of near-field and far-field earthquakes was investigated. For this purpose, a 5-story reinforced concrete structure with a medium-flexural frame, which was analyzed, designed, and implemented according to the first edition of the 2800 Code, is analyzed and redesigned according to the fourth edition of the 2800 Code, and after Demand-to-Capacity Ratio (DCR), the necessity of seismic improvement of the building in question is investigated according to the 360 ​​publication. Next, by adding a shear wall to the original structure under study, its performance is investigated in terms of increasing lateral stiffness and improving seismic performance. The variables examined to select the best improved structure include adding a symmetrical or asymmetrical shear wall to the peripheral or internal frame. Removing the corner or middle column from the first or fifth floor, as well as using earthquake records from the far and near fields, are other variables of this study. The results of this study show that the best scenario for using a shear wall is to place it symmetrically in the perimeter frame. The results of the structural response study, including vertical displacement, horizontal displacement of the roof, relative displacement of floors, and dissipated strain energy in different scenarios of the best improved structure, indicate that the worst case is related to the removal of the corner column of the fifth floor, and the best case is associated with the removal of the middle column of the first floor. Also, in comparing the records of the far and near fields, the response of the structures in the near field is greater than in the far field.