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In order to solve the injury of optical sight to shooters,which is produced by recoil for using artillery or firearms,and the usage problems of shooters eye mask,headband and gas mask,the ocular with long exit pupil distance has been designed based on optical sighting system.The optical properties and aberration characteristics of ocular with long exit pupil distance has been analyzed,the structural style with positive-positive-negative three lens groups has been put forward.