To　investigate　the　effect　of　low-temperature　freeze-thaw　cycles　(-40–20°C)　and　chloride　attack　on　the　bond　performance　between　steel/BFRP/CFRP/GFRP　bar　and　concrete,　48　pull-out　specimens　were　subjected　to　bond　tests.　The　parameters　included　bar　type　and　freeze-thaw　cycles　(0−150).　Results　show　that,　in　terms　of　the　different　freeze-thaw　cycles,　the　order　of　bond　strength　between　the　bar　and　concrete　is:　BFRP　bar　＞　CFRP　bar　＞　GFRP　bar　＞　steel　bar.　Meanwhile,　150　freeze-thaw　cycles　combined　with　the　15　days　of　chloride　attack　lead　to　at　least　20.5　%　decreases　in　the　bond　strength　and　at　least　13.5　%　reductions　in　the　peak　slip　for　both　the　steel　and　FRP　bar　specimens.　In　addition,　under　the　low-temperature　freeze-thaw　and　chloride　attack,　FRP　bars　show　better　bond　performance　than　steel　bar,　and　BFRP　bar　is　recommended　to　be　adopted　due　to　its　relatively　high　bond　strength　(e.g.,　2.5　times　that　of　steel　bar)　and　relatively　small　reduction　of　bond　strength　after　150　freeze-thaw　cycles　combined　with　15　days　of　chloride　attack　(e.g.,　22.1　%).　Furthermore,　considering　the　effects　of　low-temperature　freeze-thaw　and　chloride　attack,　bond　stress-slip　curves　between　steel/BFRP/CFRP/GFRP　bar　and　concrete　are　proposed　based　on　the　experiments　in　this　study,　which　are　verified　by　the　experiments　in　other　studies.　©　2025