The design of a dual-color infrared optical system for use on smart ammunitions was introduced. The selections of optical system parameters and optical system structure were given, together with the aimed objectives of the dual-color infrared optical system. Characteristics of the optical system were tested. Many unique means were adopted to meet the specific requirements in missile-borne systems. The optical system has the advantages of simplicity, compactness, small off-axis aberrations and evenness of il...