To totally obtain infrared characteristic of satellites, it was necessary to know the infrared characteristic of satellite orbit-control thruster plume. A complete model for calculating the infrared radiation of satellite orbit-control thruster plume was founded. The model calculated the plume flow field, absorption coefficient and radiative luminance by using Finite Volume Method (FVM) in order. According to the spectral luminance obtained by using the model, the spectral and band radiative intensity at the range of 1 000~4 500 cm-1 were calculated further. Through analysis of the intensity, the spectral intensity values at 1 525 cm-1, 1 700 cm-1, 2 155 cm-1, 2 175 cm-1, 2 350 cm-1 and 3 750 cm-1 are larger than the values at other spectrums; and the largest band intensity may be corresponding to different azimuth angle at different vertical distance to the nozzle exiting plane. The figure of spectral intensity curve at 2 350 cm-1 and 3 750 cm-1 well agrees with the figures in similar papers. The result shows that the calculation model is reliable and accurate.