The　headed　studs　as　connectors　play　a　key　role　in　affecting　the　mechanical　properties　of　steel-UHPC　composite　slab.　In　this　paper,　eighteen　tensile　specimens　were　tested　to　analyze　the　failure　mode,　loading　process,　bearing　capacity　and　stiffness.　Where　the　studs　(diameter　of　13　mm)　commonly　used　in　steel-UHPC　composite　structure　were　taken　as　the　subject,　and　the　steel　fiber　content　(0　%,　1　%,　and　2　%)　and　specimen　size　(160　mm　and　200　mm)　were　the　parameters.　The　influence　of　each　parameter　on　the　tensile　load-interface　separation　curve,　failure　mode,　tensile　bearing　capacity　and　tensile　stiffness　was　then　analyzed.　There　are　two　typical　failure　modes,　that　is,　UHPC　cone　failure　and　stud　fracture.　Test　results　show　that　specification　ACI　349-13　indicated　a　relatively　high　calculation　accuracy　to　predict　the　tensile　bearing　capacity　of　specimens　with　UHPC　cone　failure,　and　the　tensile　stiffness　value　can　be　calculated　based　on　the　secant　modulus　with　0.1　mm　slip.