Abstract: Dual hot wires were used to separate the simultaneous signals due to temperature fluctuation and velocity fluctuation appearing in high tempera tureturbulence measurements. The coefficients in the sensitivity equation inmeasuring turbulent fluctuation with constant-temperature hot-wire anemometry were deducted, combined with the temperature fluctuation sensitivity equation of constant-current hot-wire anemometry, thus separating the temperature-fluctuation component from the mixed signal, and leading to more accurate determination of the turbulent velocity fluctuation signal and other main turbulence parameters.