To study luminous intensity of pyrotechnics composites containing nano composite material and aluminum powder, a nano composite material KClO₄/CNTs was prepared based on double decomposition reaction of NH₄ClO₄ and KOH. Its structure was characterized by fourier transform infrared spectrometer(FTIR) and X-radiffraction. The component contents of KClO₄/CNTs were analyzed by adopting chemical analysis method. The luminous intensity of different pyrotechnic composites, such as KClO₄/CNTs-Al and KClO₄-CNTs-Al and KClO₄-Al, was determined. Results show that KClO₄ can effectively be loaded on the surface of CNTs and is completely coated. The average diameter of the prepared KClO₄/CNTs composite material is 74.0 nm. The mass ratio of the two substances measured by chemical analysis method is 78:22. Compared with the KClO₄-CNTs-Al and KClO₄-Al pyrotechnic composites, the luminous intensities of KClO₄/CNTs-Al (its proportion by weight is 77:23) pyrotechnic composite are separately improved by 39.4% and 88.2%. The improvements of luminous intensity result from nanocrystallization of potassium perchlorate and the catalysis and combustion of carbon nanotubes, among them, the contribution of potassium perchlorate nanocrystallization to the luminous intensity is better than the carbon nanotubes.