Abstract: For explosives in atmospheric environment, the radiation intensity of the test method is relatively mature. With the rapid development of high altitude or outside atmosphere explosives development technology, for such explosive transient testing requirements of infrared radiation intensity become more and more urgent. Since the outer space environment was a kind of low temperature near the vacuum environment, and the field measurement was not available, it was creatively put forward the simulation of vacuum environment in the laboratory to test the infrared radiation intensity of explosive, and a dedicated vacuum environment and testing methods were further established. The 4 sets of specific components of the fire explosives were measured using the special test equipment, and the measurement results were analyzed. In view of the existing problems, the future direction of improvement was expounded.