The　composite　structure　composed　of　ultra-high　performance　concrete　(UHPC)　and　normal　concrete　(NC)　has　been　widely　applied　to　engineering　structures.　U-shaped　shear　studs　play　an　important　role　in　the　combination　of　the　UHPC-NC　interface.　To　investigate　the　interface　shear　characteristics　of　UHPC-NC　with　U-shaped　shear　studs,　the　numerical　model　with　14　various　parameters　is　calculated　based　on　the　interface　push　tests.　The　influences　of　diameter,　stud　number,　NC　elastic　modulus,　NC　compressive　strength　on　the　shear　characteristics　of　the　UHPC-NC　interface　are　analyzed.　The　results　show　that　the　load-slip　curves　of　the　UHPC-NC　interface　with　a　U-shaped　shear　stud　have　three　stages:　elastic　stage,　elastoplastic　stage　and　descending　stage.　The　fitting　formula　with　the　power　function　as　the　basic　function　can　well　express　the　influence　law　of　diameter　on　the　interface　shear　capacity.　The　interface　shear　capacity　is　not　sensitive　to　the　elastic　modulus　and　compressive　strength　of　NC,　and　it　does　not　increase　or　decrease　with　the　increase　of　stud　number,　the　shear　strength　of　a　single　stud　tends　to　be　constant.　©　2023　Ernst　&　Sohn　GmbH.