A double-fiber Bragg grating sensor for simultaneous discriminating measurement of temperature and pressure is proposed based on thin-wall flexible metal alloy cylinder.FBG1 and FBG2 are stuck to the hollow and solid sections of cylinder along the axis direction by strong pastern.The changes of temperature and pressure result in the wavelength shift of FBG1.Only the change of temperature in the cylinder causes the wavelength shift of FBG2,the pressure′s influence can be neglected.The external pr...