A fiber Bragg grating sensor which consisted of two FBGs for high temperature and high pressure wells was designed and fabricated.In the sensor,the highly elasitic alloy was chosen as the substrate,and the sensor was packaged on the substrate with the high temperature-corroding-resistance materials.The experimental calibrations show that the sensing ranges of pressure and temperature are 0-20 MPa and 0-315 ℃,respectively;the pressure sensitivity is 0.01 nm/MPa and the maximum tunable wavelength ...