Large-scale equipment manufacturing, spacecraft formation flying in space, and other fields are facing large-range, high-speed and high-precision absolute distance measurement requirements. The traditional interferometric phase method and time-of-flight method can no longer meet the measurement requirements. With the advent of optical frequency combs, the high-resolution characteristics of the optical frequency combs in the time and frequency domains can be used for ranging. After solving the problem of range expansion, the dual optical comb ranging has become an optical ranging method that integrates large-scale, fast measurement, and high precision. The article describes the development process of optical comb ranging, expounds the problems and solutions encountered in the development process of dual-comb ranging, such as range expansion, noise suppression, air refractive index compensation, and light source miniaturization. It provides theoretical guidance for the improvement of dual optical comb ranging system.