The combustion characteristics of pyrotechnic composition was studied. The feasibility of using multi-spectral thermometry to test the flame temperature of pyrotechnic composition was analyzed. The multi-spectral thermometer system with twelve testing channels was developed. The correctness and the stability of the multi-spectral thermometer system were verified using the Israel CI systems SR-20-33 black body which temperature precision is ±3 ℃. The flame temperatures of a type of electric igniters were tested using the multi-spectral thermometersystem.