Based on the Mie scattering theory,the theoretical analysis and numerical calculations of SiC particle′s light scattering intensity are carried out.we obtained the distribution characteristics of scattering intensity in abnormal dispersion region and abnormal dispersion region of middle infrared band,which reveal the inherent law between incidence wavelength，mediums′ refractive index and scattering intensity.This research result provides a theoretical basis for the development and application of this material in middle infrared region.