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Wavefront coding is a technology which combination of the optical design and digital image processing.By inserting a phase mask closed to the pupil plane of the optical system,the wavefront of the system is re-modulated.And the depth of focus is extended consequently.In reality the idea is same as the athermalization theory of infrared optical system.In this paper,an uncooled infrared dual field optical system with effective focal as 38mm/19mm,F number as 1.2 of both focal length,operating wavelength varying from 8μm to 12μm was designed.