Abstract: This paper designed a scheme for reducing the influence of background radiation, when the radiation thermometer was used to measure the temperature of an aero-engine turbine blade. Based on Planck Law, this temperature measurement equation was established including the influence of background radiation. The true temperature of the measured target was obtained by calculating the effective emissivity. The design of the simulation test used two high-temperature radiation sources to heat the selected sample and simulate high-temperature background, and a scanning turbine blade temperature field measuring device to measure the temperature of the selected sample. The results show that the maximum temperature difference is 27.2 ℃ before and after the correction of the background, when the target is set at 800 ℃ and the background is set at 1 000 ℃. The maximum proportion of the temperature difference is 3.82% before the correction. The corrected target temperature is closer to the temperature without background influence. This test verifies the great application value to the temperature monitoring during the engine development.