Abstract:Accordingtothestructurefeatureoflasertriangulationdisplacementsensor,beamspeckleselfmeasuringmethodoflasertriangulationdisplacementsensorisdevelopedbyusingtheopticalpathandthephotonicsdetectoroflasertriangledisplacementsensoritself.Theradiusofthemeasuredbeamspecklecanbevariedfrom50mto5mm,themeasurementresolutionofthesensoris1m.Thismethodhasthecharactersofsimplefyingtheapparatusandadjustingconveniently.Theexperimentalresultshowsthatthetechniqueisrealizable.