The fiber Bragg grating(FBG) was be mount on the surface of TJ J type equi intensity cantilever,where the strain was derived from the loading,and these reflected spectra of grating followed by the variation of strain were obtained by optical analyzer.The result indicated that the response of wavelength shift of the grating bonded on the cantilever to the loading was 0.155 nm/kg pull(strain) and -0.156 nm/kg push(strain).It is worth noting that the maximum standard error was 0.03 nm,and met the precision of the wavelength channel in the currently WDM technique.