A novel “dielectric structure pyrotechnic initiator” was proposed by integrating reactive multilayer films. The initiator sample prepared by Al/CuO-based reactive multilayer films was fabricated using standard micro electrical mechanical techniques. The dimensions of sample are of 2000 μm×2000 μm×2.6 μm and the resistances is about 4 Ω. It is found that the sample will explode completely after constant voltage has run over 60 V in open-air. The exothermic reaction of Al/CuO multilayer films was proved through analyzing the histories of current,meanwhile Cu produced by exothermic reaction results in “delayed-time discharge” of the initiator. A system based on the double-line atomic emission spectroscopy was used to obtain electrical-explosion temperature and its duration of the pyrotechnic initiators. The electrical-explosion temperature covers from 2500 K to 3500 K and its duration is 0.35 ms when the pyrotechnic initiator is discharged in 60 V. Furthermore,the electrical-explosion temperature covers from 3500 K to 4000 K and its duration is 0.55 ms when the pyrotechnic initiator is discharged in 80 V.