Abstract: Aim To determine the flame spectra of the samples of several pyrotechnic mixes. Methods Pyrotechnic columns were made from the pyrotechnic mixes conta ining the mitrate of Na, K, Rb and Cs The flame spectra were measured by OMA- 4. The radiation bands in the spectra of pyrotechnic mixes containing the nitrate oxidizen such as NaNO3, KNO3, RbNO3 and CsNO3 were analyzed. Results K, Cs and Rb, expect Na, have stronger and wider radiation in the infrared area, which can activate the radiation of actom or molecule in the proccess of combustion so as to enhance the infrared radiation. Conclusion The nitrate of K, Rb and Cs are suitable for being used as oxidizer in the pyrotechnic mixes for infrared illuminant flare.