In optical sights,high temperature endoscope,copy Lens and large range zoom lens and other optics systems,often employ relay systems to achieve system extension,image erection and pupil coupling.In this paper,a design of super wide band relay system is proposed to realize the aberration correction requirements,glass selection method and obtain the design results.The results of Zemax showed that with working spectral range 0.4～1.7μm,NA=0.2 and 10mm field of view,the MTF of the system is almost diffraction limited,with an axial color difference of less than 40μm and the imaging quality is good.