To realize the miniaturization and lightweight design of air-to-air missile seeker, a high resolution long-wave infrared imaging guidance optical system is designed by adopting the overall layout of the roll-inverting seeker and using the reflection mirror turn-around optical path. Prototype design results demonstrate that the optical system focal length is 100 mm, field size is 5.5°×4.4° at 16 lp/mm, axis view of the modulation transfer function(MTF) is higher than 0.54, the off-axis transfer function(MTF)...