The ejector is mainly used to connect or separate aerospace structures or parts. The product, which is installed as a structural connecting member, provides some separation impulse for the structure-separating portion in the ignition operation. The internal structure of the product is similar to an unlocking bolt, but the principles for charge and internal ballistic design are slightly different. The projectile objects (with a mass ranging from 0.1kg to 4kg) are provided with an initial separation velocity of 1 ~ 50m/s according to the general requirements. As the ejector has to provide a relatively high speed in a very short time and distance, there will be recoil in the mounting portion of structural body in the ejection operation.