The main purpose of this study was to evaluate the vulnerability of steel shear walls using brittleness curves. To achieve this goal, the amount of ductility and damage index of several sample frames reinforced by steel shear wall are evaluated by modeling and performing nonlinear static and dynamic nonlinear analyzes, and damage index control based on ductility is introduced as a performance acceptance criterion. Seismic performance was evaluated using IDA incremental dynamic analysis and fragility curves were obtained using displacement and ductility index. According to the results, a relationship between performance levels and damage index is presented, which indicates the probability of passing performance levels in each of the structures. Damage index for each model was calculated by extracting increasing curves, as a result of which other structural characteristics such as stiffness, ductility and yield point of the structure can be obtained. The advantage of this method and the introduction of fragility curves based on damage index is determining the ductility parameter based on the structural criteria of the structure. Based on this, the strength of each structure can be calculated according to the yield displacement of the structure.