Abstract: The minimized design was realized by using the design of fast zooming route cam curve and the method of cam curve flatness optimization according to the requirement of the detection device TV channel for realizing the conventional color mode and fog transparent black/white mode. In the design, the visible light plus near infrared band and a method of image quality evaluation in the range of the whole band was applied to meet the needs of observation in the conventional color mode and fog transmission black/white mode on the premise of avoiding the focal shift of zoom. The system was passed through MTF test, imaging verification, environment stress screening and environment routine experiment, and was equipped to the detection device successfully.