A new structure of fiber Bragg grating (FBG) sensor based on sticking two FBGs on tubular elastic element is developed. Simultaneous measurement for the pressure and temperature has been experimented by two FBGs producing two wave spike respectively. In the range of 0～20 MPa and 20～150 ℃, the FBG's Bragg wavelength change is linear to the pressure and temperature. The pressure and temperature sensitivities are 0.089 nm/MPa and 0.024 nm/℃ respectively. The experimental value of coefficient matrix of the FBG's wavelength change to pressure and temperature is coincidented with the theoretical value very well, and the relative error is 1.8%. Compared with the standard measurement method, and the accuracies of pressure and temperature are 0.47% and 0.74% respectively. The method can cut the error arising from the temperature cross-sensitivity in pressure, the error of which is about 0.16% as pressure and temperature are at 20 MPa and 150 ℃ respectively.