Steel-Ultra-high　performance　concrete　(UHPC)　composite　slab　has　many　applications　in　long-span　bridges,　in　which　the　headed　stud　connectors　play　a　key　role.　To　explore　the　shear　resistance　of　headed　studs　in　steel-UHPC　composite　slab,　six　push-out　specimens　of　headed　stud　were　carried　out,　and　different　calculation　methods　were　evaluated　based　on　the　test　results,　including　six　methods　to　calculate　the　shear　bearing　capacity,　five　models　to　predict　the　shear　slip,　and　ten　methods　to　calculate　the　shear　stiffness.　The　test　results　show　that　the　headed　studs　in　all　specimens　appeared　to　break　at　the　junction　of　the　weld　root,　and　the　UHPC　slabs　remain　intact　except　for　partial　damage　at　the　root　of　the　studs.　The　shear-slip　curves　of　headed　stud　were　divided　into　three　stages,　i.e.,　the　elastic　stage,　the　elastic-plastic　stage　and　the　descending　stage.　The　maximum　slip　of　all　specimens　is　less　than　3.5　mm，and　the　limit　of　elastic　slip　can　be　taken　as　0.1　mm.　The　results　show　that　the　calculated　shear　resistance　of　headed　stud　in　UHPC　was　lower　than　the　test　results　according　to　some　specifications　without　considering　the　contribution　of　stud　welds.　It　is　recommend　that　the　stud　welds　contribution　coefficient　can　be　taken　as　1.1　on　the　basis　of　the　results　of　2　sets　of　tests　in　this　research　and　29　sets　of　other　effective　data.　The　prediction　results　of　different　shear-slip　models　were　different　from　the　test　results.　It　is　suggested　that　the　inverse　proportional　function　model　should　be　used　to　achieve　accurate　prediction.　The　actual　force　state　of　stud　was　not　considered　in　the　calculation　of　shear　stiffness,　resulting　in　significant　difference　in　the　calculation　results.　It　is　recommended　that　the　shear　stiffness　corresponding　to　the　slip　of　0.1　mm　can　be　taken　as　the　elastic　shear　stiffness.　The　relationship　between　the　shear-slip　model　and　the　shear　stiffness　of　headed　stud　was　established　to　provide　a　reference　for　calculation　without　test　data.　©　2023　Tsinghua　University.　All　rights　reserved.