The combustion spectrums of single base，double base and modified double base propellants are measured with the whole-band radiometer in order to research the combustion performance. The combustion spectrums and radiation intensities of the visible light and near infrared are obtained by the test and calculation. The radiation intensity of modified double base propellant in near infrared region is lower than that of single base and double base propellant，so the combustion temperature of modified double propellant is lower and the ablation of the combustion for gun barrel decreases. It is suggested that the combustion spectrum can be used in identification of compositions.