Tensile　property　is　one　of　the　excellent　properties　of　ultra-high　performance　concrete　(UHPC),　and　uniaxial　tensile　test　is　an　important　and　challenging　mechanical　performance　test　of　UHPC.　Traditional　uniaxial　tensile　tests　of　concrete　materials　have　inherent　defects　such　as　initial　eccentricity,　which　often　lead　to　cracks　and　failure　in　non-test　zone,　and　affect　the　testing　accuracy　of　tensile　properties　of　materials.　In　this　paper,　an　original　integrated　design　scheme　of　mould　and　end　fixture　is　proposed,　which　achieves　seamless　matching　between　the　tension　end　of　specimen　and　the　test　fixture,　and　minimizes　the　cumulative　eccentricity　caused　by　the　difference　in　the　matching　between　the　tension　end　of　specimen　and　the　local　stress　concentration　at　the　end.　The　stress　analysis　and　optimization　design　are　carried　out　by　finite　element　method.　The　curve　transition　in　the　end　of　specimen　is　preferred　compared　to　straight　line　transition.　The　rationality　of　the　new　integrated　design　is　verified　by　uniaxial　tensile　test　of　strain　hardening　UHPC,　in　which　the　whole　stress-strain　curve　was　measured,　including　the　elastic　behavior　before　cracking,　strain　hardening　behavior　after　cracking　and　strain　softening　behavior.　©　2022　Techno-Press,　Ltd.