In　this　article　the　temperature　sensing　properties　of　pi-phase-shifted　fiber　Bragg　grating　(pi-PSFBG)　were　investigated.　Surface　coating　is　one　of　the　commonly　used　modification　methods　for　fiber　gratings,　which　can　improve　its　sensing　performance　and　even　enable　it　to　sense　more　physical　quantities.　In　this　article,　we　aim　to　study　the　effect　of　coating　on　the　temperature　sensing　performance　of　pi-PSFBG.　Indium　tin　oxide　(ITO)　films　are　widely　used　in　the　optoelectronics　industry　due　to　their　unique　combination　of　electrical　conduction　and　optical　transparency.　In　this　paper,　the　ITO　film　was　coated　on　the　surface　of　pi-PSFBG　by　pulsed　laser　deposition　(PLD)　method　to　improve　its　sensing　performance.　In　the　practical　application　of　fiber　optic　sensors,　multiple　sensors　are　often　used　simultaneously,　which　leads　to　the　mutual　interference　superposition　between　the　spectra.　In　this　case,　the　stable　extraction　of　the　sensing　signal　is　a　problem　worth　considering.　The　sensing　stability　of　several　interference　optical　paths　and　cascaded　optical　paths　before　and　after　pi-PSFBG　coating　is　investigated　and　compared.　After　the　surface　is　coated　with　a　layer　of　0.19　mu　m　thick　ITO　film,　the　temperature　sensing　sensitivity　of　pi-PSFBG　is　increased　by　about　15%.　It　was　found　that　the　coating　of　ITO　film　enhanced　the　stability　of　pi-PSFBG　in　various　optical　paths.