Based　on　the　self-developed　steel　fiber　position　device　that　can　accurately　control　the　spatial　position　of　steel　fiber,　the　effects　of　steel　fiber　embedded　depth,　diameter　and　embedded　angle　on　the　pull-out　behavior　of　steel　fiber　in　ultra-high　performance　fiber　reinforced　concrete　(UHPFRC)　were　studied.　The　results　indicate　that　the　maximum　pull-out　force,　pull-out　work,　maximum　pull-out　stress　and　strength　utilization　rate　of　steel　fiber　increase　with　the　increase　of　steel　fiber　embedded　depth.　However,　the　maximum　average　bond　strength　decreases　with　the　increase　of　steel　fiber　embedded　depth.　With　the　increase　of　steel　fiber　diameter,　the　maximum　pull-out　force,　pull-out　work　and　maximum　average　bond　strength　of　steel　fiber　increase　correspondingly,　while　the　strength　utilization　rate　and　maximum　pull-out　stress　of　steel　fiber　decrease.　With　the　increase　of　steel　fiber　embedded　angle,　the　maximum　pull-out　force　and　pull-out　work　of　steel　fiber　increase　first　and　then　decrease.　The　maximum　pull-out　force　and　pull-out　work　reach　the　maximum　value　at　45°　and　30°　of　embedded　angle,　respectively.　When　the　embedded　angle　is　75°,　the　failure　mode　of　specimen　is　that　the　steel　fiber　is　broken.　©　2023　BULLETIN　OF　THE　CHINESE　CERAMIC　SOCIETY.　All　rights　reserved.