The　thin-film　pressure　sensor　in　prosthetic　tactile　measurement　has　problems　of　low　accuracy,　poor　linearity　and　high　hysteresis.　To　address　these　issues,　a　tactile　sensor　based　on　the　fiber　Bragg　grating　(FBG)　is　studied.　It　can　be　easily　installed　on　the　fingertip.　Firstly,　a　sensing　unit　is　designed　to　convert　the　external　force　into　an　axial　one　needed　by　the　FBG.　Secondly,　the　finite　element　simulation　is　utilized　to　optimize　the　structure　of　the　sensing　unit.　In　this　way,　the　sensitivity　of　pressure　measurement　is　improved.　Finally,　the　FBG　tactile　sensor　is　prepared　and　stuck　to　the　prosthetic　fingertip.　Experiments　on　performance　calibration,　comparative　analysis,　and　grasping　application　are　carried　out.　Results　show,　for　the　FBG　tactile　sensor,　the　sensitivity　is　0.103　8　nm/N,　the　linearity　R2　is　0.998,　the　repeatability　error　is　1.32%,　and　the　hysteresis　error　is　2.19%.　Compared　with　the　thin-film　pressure　sensor,　the　designed　FBG　sensor　has　advantages　of　linearity,　stable　repeatability,　and　hysteresis.　©　2021,　Science　Press.　All　right　reserved.