A thin-walled cylindrical liquid temperature and pressure sensor based on distributed sensing technology was designed. The sensors are packaged with stainless steel 316L and beryllium bronze C17200, which have corrosion resistance, good elasticity, and a large thermal expansion coefficient. The finite element simulation software ANSYS Workbench was used to simulate and analyze the pressure and temperature characteristics of the packaged sensor, and the radial strain of the device was obtained, and the relationship between the Brillouin frequency shift and the pressure and temperature was analyzed. The simulation experiment shows that the pressure sensitivity and temperature sensitivity of the sensor using the beryllium bronze C17200 package is higher. The pressure sensitivity can reach 11.1MHz/MPa and the temperature sensitivity can reach 2.56MHz/℃ in the range of 0~12MPa and -5~40℃. Compared with ordinary single-mode fiber, it is increased by 7.4 times and 1.7 times respectively.