Abstract: The 1-D analytic formulae of direct radiant exchange areas and matrix expressions of total radiant exchange area are given taking account of the scattering effects of sharing media to calculate simulatively the radiant exchange areas in an 1-D system having sharing media. In comparison to the description neglecting the scattering effects of media, the numerical simulation results showed that the total radiant exchange area between gas and surface zones decreases due to the weakened scattering effect of media, while that between gas zones increases. The stronger the scattering effect of sharing media, the greater the calculation error resulting from neglecting their scattering properties.