Abstract: Capacitors are important storage components in pulsed power equipment. In order to reinforce the reliability of power source equipment, this paper studies how to increase the lifetime of the metallized film pulsed capacitor from the following aspects: electrode structure, heat treatment and working electric field intensity. The results show that the temperature of heat treatment is defined by considering the shrink of polypropylene (PP) film and the thickness of electrode. For different sheet resistance, the temperature of heat treatment has an optimal value, when the self-healing energy is minimal and the lifetime is longest for the capacitor. For different electric field intensity, it should be considered that there was tradeoff between partial discharge at the edge of electrode and capa