This approach of the spectral emissivity determination is the development at the new method on radiation ther-mometry without black body. In this paper we consider an application of directional relative reflectometry, which in this method completely excludes the influence of the radiation surface character. That means that this reflectometry method does not subordinate to Lambert's law. With measuring the coefficients of the directional relative reflection in discussed method the simultaneous measurements the intensity of two spectral components of the own radiation are measuring. By measuring of the ratio of reflection coefficients on each wavelength (λ_1, λ_2) for each pair of the unknown temperatures (T_1,T_2), (T_2,T_3) and involution with (λ_1,λ_2) the ratio of the spectral emissivities of the own radiation with the same wavelengths and the same temperatures we come to six equations with six unknown meanings of the emissivities. The solution of the equations gives the estimations of spectral emissivities.
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