Abstract: In order to meet the visual requirements of individual equipment, two kinds of large exit pupil diameter eyepieces of different structures are optimized designed 2.1 in LCD. With the same system parameters, the two eyepieces achieve 27 mm exit pupil distance, 2.1 in LCD observation with a focal length of 75 mm and a field of view of 29.5° under the premise that the exit pupil diameter is 68mm. Firstly, a refracting eyepiece system consisting of a refracting sphere is designed, which is composed of 9 lenses. Secondly, one of the spheres is set as an aspherical surface to obtain a refracting eyepiece containing. The aspherical refractive eyepieces are greater than 0.2, and the MTF of the center field of view reduced by 9.7%, the distortion is reduced from -2.95% to -0.616%, and the MTF value is higher after tolerance allocation, and the image quality is better. The design of aspherical eyepiece in this paper can systematically correct the advanced spherical aberration, reduce the risk of image deformation due to the large target surface, and reduce the engineering risk due to the insensitive system.Compared with pure spherical surface, the optical and mechanical structure has a good application prospect, especially for individual soldier observation.