The parameters of concentration and temperature distribution of particles and radiative parameters of gas phase molecular species are computed. The Discrete Ordinates Method in general body-fitted coordinates is used in investigating the relation between the radiation field of exhaust plume and flight altitude and Mach number, and the influence of media radiative properties on plume radiation is also analyzed. The results show that the media radiative properties intensively affect the exhaust plume radiation, for example, the particles scattering can smooth the radiative field in exhaust plume. Under the conditions described in the paper, the spectral radiative intensity vertical to axis is maximal.