With the aim to serve in bad environments and to meet the requirements of real-time and long-term service, a new kind of double parameters and high temperature-pressure fiber Bragg grating(FBG) sensor with a temperature-compensator was put forward. Firstly,the constant elasticity alloy was selected based on the special environments for the sensor. Then, a new kind of structure combined with a circular cylinder and a circular diaphragm was designed by taking the optimized constant elasticity alloy as the substrates. Finally, three experiments of temperature, pressure and temperature-pressure were performed. Experimental results indicate that the sensor not only has great temperature and pressure detection ranges, but also can realize the linear measurement within the ranges of 0~60 MPa and 0~350 ℃.The experiments offer the pressure sensitivities in 0.013 6 nm/MPa, temperature sensitivity in 0.020 1 nm/℃, and the static errors in 0.046% and 0.029%,respectively. These indicators can meet the requirements of practical engineering applications.