Side-strengthened　reinforced　concrete　or　precast　prestressed　concrete　beam　for　inadequate　seismic　performance　is　proposed　in　this　paper.　The　factors　are　simulated　by　ABAQUS　software　for　the　impact　of　seismic　performance,　which　are　difference　of　material　strength　grade,　initial　load　and　the　order　of　prestressing　and　pretightening.　The　strengthening　technology　can　improve　the　seismic　performance　of　side-strengthened　beam.　The　meterials　with　different　strength　grades　which　used　for　beams　give　full　play　to　their　role.　The　initial　load　has　little　effect　on　the　seismic　performance.　The　way　of　prestressing　after　pretightening　plays　a　favorable　effect　for　the　seismic　performance.　The　simulation　results　can　accurately　reflect　the　impact　of　these　factors　on　the　side-strengthened　beam.