Design of a wide-angle off-axis optical see-through helmet-mounted display(HMD)becomes a challenge since its weight and size are constrained by human factors. Diffractive optics has the potential to play a key role in several areas of head-mounted display. They can reduce size and weight while providing some unique functions that would be difficult to implement with conventional refractive optics. A 60°-diagonal field-of-view,wide spectral band hybrid diffractive refractive see-through HMD using off-axis optics is proposed. It possesses a 10mm exit pupil diameter and a 22mm eye relief,and satisfies the requirements of human factors. In addition,the chromatic aberration is only 14μm,and the whole optical system is suitable for a 15mm-diagonal color liquid crystal display(LCD) with SVGA resolution.