Because of off-axial display, field of view in collimated display system of flight simulators is restricted and forward movement of eye point reduces edge imaging quality greatly, design a new off-axial virtual image display system. Use aberration theory, adopt light tracking method, reversely track light in full vision field stereo space, and use defocused spots mean square root radius and parallel degree error to carry out image quality evaluation for R2450-500-60° visual system. The results show that the design can improve image quality, reduce binocular non-parallelism, and make the edge field angle and image quality meet the requirements. The design system can improve its optical properties, and extend vertical field of view to 60°. It fulfills the large field of view requests of multi-mission flight simulators with low cost.