Multi　parameter　measurement　based　on　optical　fiber　sensor　has　been　a　research　hotspot　in　recent　years.　In　this　work,　four　kinds　of　optical　fiber　sensors,　LPFG,　FBG,　PMF　and　SMS　are　used.　The　transmission　characteristics　and　sensing　characteristics　of　each　sensor　are　analyzed　in　detail.　Based　on　the　modulation　of　resonance　wavelength　by　environmental　variables,　the　accurate　and　synchronous　real-time　detection　of　temperature,　stress,　refractive　index　and　humidity　is　realized.　We　use　all-optical　coupling　cascade　and　wavelength　division　multiplexing　(WDM)　technology　to　prepare　a　highly　integrated　sensing　device.　The　problem　of　signal　crosstalk　of　each　sensor　is　solved,　and　the　cost　of　signal　transmission　and　reception　is　greatly　reduced.　It　is　of　great　significance　for　monitoring　a　variety　of　environmental　variables　under　extreme　conditions.