Due to the strong background radiation inside the aero engine, there is a large deviation between the temperature value obtained by measuring the surface of the turbine blade using the conventional radiation temperature measurement system and the actual temperature value. To address this issue, a new generation of turbine blade surface temperature measurement system was developed based on the principle of multispectral temperature measurement. The system uses movable mirror probes and fixed mirror probes to achieve high⁃reliability scanning, realizes efficient signal acquisition and precise control of equipment through high⁃speed multi⁃channel synchronous signal acquisition and control system, and realizes online measurement and reconstruction of three⁃dimensional temperature field on the blade surface by using multispectral temperature measurement modeling in complex thermal environment, multi⁃view three⁃dimensional temperature field reconstruction and other technologies. The performance indexes of the multispectral turbine blade surface temperature field measurement system were tested by using a blackbody radiation source and a dynamic calibration device, and the results showed that the system could achieve real⁃time online measurement of the surface temperature of turbine blades at 550 ~ 1 500 ℃, and the maximum allowable error did not exceed ± 7.5 ℃, which met the temperature measurement requirements of turbine blades. The research results provide strong support for promoting the development of thermal parameter testing technology for aeroengine turbine blades in high⁃temperature and complex environments.