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This study is to present the impact load for designing steel barrier for parkade. For the evaluation of impact load, barrier structuremust be determined first. Even two barriers are made of the same beam and post members, structural stiffness differs depending on thebase type and interval of posts, which result in different impact responses. Therefore, to get the general impact load for designing steelbarrier for parkade, various base types and span lengths must be considered. In this study, barrier made of W-beam and steel tubeposts of 101.6×4.5mm with 1m to 3m span with 0.5m increment were studied. For each structures, two impacts, one onto the cen-tral post and the other onto the middle of central span beam were considered. Barrier VII simulation and Olson model were utilizedfor the impact load. Impact loads were calculated from the vehicle accelerations Barrier VII simulations produced. The deformationsfrom the Barrier VII simulations were used in calculating impact loads by Olson model.