To verify the effects of viscoelastic damper for seismic mitigation,a sixstorey steel framestructure with viscoelastic dampers and the original structure without viscoelastic dampers are estab-lished and compared by the finite element analysis software MIDAS/GEN under horizontal seismic.The analysis testified the efficiency of viscoelastic dampers by comparing structure with viscoelasticdamper to common structure.