It is very important for systems of signal receiving or infrared imaging in missile weaponry. Each key link for developing compound antenna of millimeter wave/infrared imaging is systemically analyzed in this paper. It includes four parts: an infrared imaging system, a millimeter wave detector, an optical scanner and an infrared detector. The designed method of optical imaging system and optical scanner have been described. This optical system consists of two aspherical mirrors i.e. Cassegrain system, the designed datas have been given.