The infrared radiation property of solid propellant plume was measured by a BOMEN MR-254 infrared spectrometer. At the resolution of 4 cm^-1 and the testing distance of 5 m between the plume and the spectrometer, the infrared emission spectra of aluminized solid propellant and NEPE solid propellant were recorded in real time. The radiation intensities of the plume vs. combustion time in 3-5 μm band region were obtained by calibrating the original spectra by instrument response function. The temperatures of the propellant plumes were calculated using the molecular fine structure emission spectral lines of the gaseous products released during combustion. Factors influencing the radiant energy and temperature of solid propellant were discussed. The experimental results show that the passive remote sensing FTIR, as a rapid, in situ and non-intrusive technology, can be used to study the infrared radiation characteristics of solid propellant plume in an effective way.