One of the mechanisms of failure in structures is progressive collapse in which one or more parts are Failured by impact or other factors in an instant and the structure is progressively collapsed. Considering the importance of the subject, in this thesis the progressive collapse in the structures has been studied. In order to investigate the effect of the type of structural system on the progressive collapse potential in steel structures, the moment resistant frames and braced frames systems were used. In this study to progressive collapse analysis in building frame, altitude load path method is used. The method used is based on a scenario remove columns to assess the potential for progressive collapse. Therefore, the removed columns were selected at different locations at the height of the structure and in the structure plan. The models were firstly modeled, analyzed and designed according to the rules of the Steel Building Regulations (Code 10) and using the SAP2000 software. Then, according to the alternate load path method (ALP), a nonlinear time history dynamic analysis was performed for each scenario. The results show that, with regard to the design philosophy of the structures, the braced frames have more potential for progressive failure. This potential is location-dependent of the column elimination in the moment frames, independent of the eliminated column location in braced frames.