A　Fiber　Bragg　Grating　(FBG)　sensor　demodulation　system　of　matched　Bragg　gating　with　a　simple　structure　is　studied.　The　cantilever　is　designed　by　using　acryl　glass,　and　the　wavelength＇s　linear　tuning　of　FBG　is　operated　by　tuning　the　cantilever　of　acryl　glass.　The　sensor　signal　of　Real-time　detect　is　detected　by　using　an　oscilloscope　after　the　optical　sensor　signal　enters　the　photoelectric　detector.　Demodulation　operation　of　matched-gating　is　achieved.　Wavelength　resolution　of　2.33pm　is　obtained.　The　advantages　of　this　demodulation　system　is　simple　structure,　electromagnetic　interference　resistance,　high　wavelength　resolution　and　high　rate　of　cost　performance,　so　it　has　a　great　application　prospect.