Abstract: A stagnation cover type total temperature and pressure fiber-optic composite probe is designed for the demand of total temperature and pressure measurement at the engine inlet. Firstly, the aerodynamic simulation of the probe structure was carried out by using the finite element method, and the influence of the probe structure parameters on the measurement results was analyzed. On this basis, the total temperature and pressure fiber-optic composite probe was fabricated and its working performance was tested by building a static test system. The experimental results show that the total temperature and pressure fiber-optic composite probe can work under the temperature and pressure composite environment of 150 ℃ and 0.25 MPa. The maximum nonlinearity of the total pressure sensor is 0.5% in the range of room temperature - 150 °C, and the maximum nonlinearity of the total temperature sensor is 4.04% in the ambient pressure environment. Finally, the temperature decoupling of the pressure parameters was completed, and the pressure measurement error in the full temperature range did not exceed 1.55%. The designed total temperature and pressure fiber optic composite probe diameter is 5 mm, which effectively reduces the interference of the probe to the flow field.