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Two methods used for microtube temperature calculation through outer microtube emission spectra are presented.Both microtube and outer microtube flame emission spectra are measured by a CCD fiber spectrometer in same environment,while outer microtube flame temperature is measured by a thermocouple.Outer microtube flame spectra are referenced spectra.In the first method,spectra correction coefficients are calculated with some wavelengths of referenced spectra.With the functional relationship between the wavelength and the emissivity in the referenced spectra,microtube flame temperature are computed from the emission spectra in the other method.The flame temperature is calculated by the methods on the spectra measurement data.