The kit is a part of the pyrotechnic mechanism. And as the energy source of the mechanism motion, the kit's working principle is identical with that of a solid-propellant rocket engine. The type and dose of the main charge are determined based on the specific requirements for energy, working time, etc. and the technical indexes of the product must be finally determined after passing a joint trial with the corresponding mechanism. As different mechanisms have different requirements for the energy-source kit, the technical requirements of the kit is also divrsified. However, the total output performance can be adjusted by rationally designing the size of the charge and the gas channel. Simple as it is in structure, the kit has high requirements for reliability.