Based on the method of superposition for radiant exchange area，scattering thermal density was defined and matrix equations were obtained for the analysis of radiant exchange areas in isotropic scattering media.The individual matrix equations and total matrix equations of total radiant exchange areas were derived for the case of a uniform grey absorbing-emitting/isotropically-scattering medium confined in an enclosure.The result was identical with that obtained with the Noble’s method.The radiant exchange areas were calculated by considering the scattering property of the medium.Because the approach was simple，with physical significance and high calculation accuracy，it could be useful in simulating radiant heat exchange accurately in isotropically-scattering media.