In　this　study,　the　influence　of　corrosion　on　the　cyclic　behaviors　of　ultra-high-strength　(UHS,　yield　strength　above　1000　MPa)　steel　bars　is　investigated.　A　total　number　of　63　specimens　with　different　corrosion　degrees　and　slenderness　ratios　are　involved　in　this　experiment.　Some　important　mechanical　indexes　that　can　reflect　the　cyclic　properties　of　steel　bars　(such　as　failure　modes,　energy　dissipation　and　stiffness)　are　analyzed　based　on　the　experimental　results.　The　influence　of　corrosion　on　these　mechanical　properties　are　quantified　through　regressions　of　experimental　results.　The　proposed　regression　models　can　well　reproduce　the　experimental　results,　which　can　be　adopted　in　the　modeling　of　cyclic　behaviors　of　corroded　UHS　steel　bars　in　future　studies.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.