Ultra-high　performance　concrete　(UHPC)　has　exceptional　mechanical　properties　and　durability,　which　offers　that　for　broad　exploitations　such　as　composite　members　and　structural　reinforcement.　Among　various　raised　technical　issues,　the　interfacial　bonding　performance　between　the　UHPC　and　existing　normal　concrete　(NC)　signifies　a　very　crucial　one.　This　paper　summarizes　the　research　progress　of　the　UHPC-NC　on　the　interface　bonding　performance　test　methods,　calculation　formulas　of　the　interfacial　shear　strength,　influencing　factors,　and　interface　durability　at　home　and　abroad.　The　shortcomings　of　this　test　for　the　UHPC-NC　are　introduced　and　explained,　and　the　applicability　of　formulas　for　evaluating　the　interfacial　shear　strength　in　various　specifications　pertinent　to　the　UHPC-NC　is　explored.　The　effects　of　various　factors　on　the　UHPC-NC　interface　bonding　performance　are　also　analyzed,　including　fiber,　interface　roughness,　interface　moisture　content,　bonding　agent,　the　strength　of　existing　concrete,　cementitious　material,　and　curing　system.　The　strengthening　mechanism　of　the　interface　characteristics　is　expounded,　and　the　current　research　on　durability　is　discussed.　The　obtained　results　reveal　that　the　interfacial　bonding　strength　of　the　UHPC-NC　is　excellent,　in　which　the　appropriate　curing　system　and　fiber　can　reduce　the　shrinkage　of　the　UHPC　and　enhance　the　compatibility　between　materials.　The　growth　of　the　interface　roughness　and　existing　concrete　strength　can　effectively　avoid　interface　failure.　Bonding　agents,　cementitious　material　and　appropriate　interfacial　moisture　content　can　improve　the　interfacial　transition　zone.　The　UHPC-NC　interface　exhibits　good　impermeability　and　freeze-thaw　resistance.　©　2023　Cailiao　Daobaoshe/　Materials　Review.　All　rights　reserved.