A rigid Mie solution on scattering by a spherical particle immersed in an absorbing medium was introduced. By combining with independent scattering discipline for polydisperse particles

a theoretical method was presented for calculating thermal radiation properties of ceramics with pores in modified Gamma distribution. Influences of pores distribution and mean diameter on thermal radiation properties of a specific Yt stablized zirconium (YSZ) were analyzed. Results show that pores distribution and mean diameter have significant influences on thermal radiation properties of the ceramic. Extinction coefficient

scattering albedo and asymmetry factor decreases with pores distribution approaching mono dispersion and increases with pores distribution approaching poly dispersion. An optimal mean diameter of pores exists for extinction coefficient in short wavelength while the coefficient decreases with pores mean diameter in long wavelength. Both scattering albedo and asymmetry factor increase with pores mean diameter.