Abstract: The present literatures have not analyzed the influence of satellite's physical parameters changing with the temperature on its infrared feature. First, the theoretical calculation models of the satellite's temperature field were established. Second, the calculation method of the satellite's temperature field was deduced with the use of the finite element method (FEM) when physical parameters of solar panels changed with the temperature. Third, the calculation models of the satellite's infrared radiant emittance and its infrared radiant intensity were established. Finally, the influence of physical parameters of solar panels changing with the temperature on the surface temperature, infrared feature and the spatial distributions of infrared radiation intensities in 3-6 m band and in 6-16 m band of the satellite were calculated and analyzed. The research results of this paper have referential value on the improving calculation precision of infrared feature and infrared detecting of spatial targets.