Table comparison of dispersive character is made between some frequently used optical glasses in visible (Vis), near-iinfrared (NIR) and short-wave infrared (SWIR). Through comparison, different dispersive characters of these optical glasses in different waveband arepointed out. Then, a kind of using and interchanging method of these materials especially in optical design process is discussed. Based on this method and apochromatic model, a wideband (Vis-SWIR) fast F-number optical system under the requirements of F/1.4, focal length of 70 mm, whole field of view of 6.3°×8.1°, waveband of 0.4~1.7 μm is designed with optical passive athermalization technology. Except the sphere dome, the optical system, which uses 4 kinds of optical glass, consists of 9 lenses, total length of 110 mm, has good image quality and tolerance character at -45 ℃~60 ℃.