Decoy delivery systems are generally installed on the surface of aircraft. For stealth aircraft, the scattering effect at certain polarization and attitude angles of the weak scattering parts such as the decoy delivery system will be very obvious when the main scattering source is effectively suppressed. The radar cross section (RCS)reduction design needs to be carried out for these parts. The radar stealth technology and the development of stealth design of decoy delivery systems on foreign aircraft are introduced to provide references for related technology research.