In　the　reinforcement　and　repairmen　of　existing　stone　structures　by　ultra-high　performance　concrete　(UHPC),　the　excellent　bonding　performance　between　UHPC　and　stone　is　the　key　to　ensure　the　reinforcement　effect.　Therefore,　in　order　to　explore　the　interface　bonding　performance　between　UHPC　and　stone,　the　effects　of　different　interface　treatment　methods　were　investigated　by　splitting　tensile　test　and　double　L-shaped　shear　test.　The　results　show　that　the　failure　modes　of　the　interface　between　UHPC　and　stone　are　mainly　divided　into　three　types.　The　interface　bonding　strength　is　the　largest　when　mode　C　failure　(stone　UHPC　failure)　occurs.　The　interface　groove　treatment　method　significantly　improves　the　interface　bonding　strength　and　interface　shear　stiffness　of　UHPC-stone　specimens.　Simultaneously,　the　interface　groove　treatment　method　effectively　improves　the　ductility　of　specimens　while　changing　the　failure　mode.　When　the　groove　depth　is　20　mm,　specimens　show　better　interface　bonding　performance.　In　addition,　the　shear　load-displacement　curve　of　specimen　includes　the　pre-slip　stage　and　the　post-slip　stage,　and　the　chisel　specimen　does　not　experience　plastic　deformation　in　the　post-slip　stage.　Under　the　same　interface　treatment　method,　the　interface　shear　strength　between　UHPC　and　stone　is　positively　correlated　with　the　interface　splitting　tensile　strength.　©　2024　Bulletin　of　the　Chinese　Ceramic　Society　Press.　All　rights　reserved.