The mold fluxes samples containing transition metal oxides TiO₂ were designed based on the composition of commercial mold fluxes in continuous casting of steel,and the relation between radiative heat transfer and the content of TiO₂ was obtained through FTIR spectrum analysis and XRD analysis.The result of FTIR analysis indicates that TiO₂ has a great negative effect on infrared transmittance of flux samples in the wavelength range of 1-6 μm.The result of XRD analysis indicates that crystallization of cuspidine was restrained with addition of TiO₂,and CaTiO₃ and other phases were found in the samples.The decrease in cuspidine phase is beneficial to strand lubrication in the mold.Radiation heat flux from the strand to the mold was calculated using a radiative heat transfer model concluded in previous study.Addition of TiO₂ was found to result in a remarkable decrease in radiation heat flux for both glassy and crystalline samples,and the heat flux tended to decrease with increasing TiO₂,with the maximal decrease reaching 30%.As a result of great refraction and scatter at surface and grain boundaries of samples,the negative effect of crystalline samples was much larger than that of the glassy ones.