Abstract: For the design of the triplet photographic lens, firstly, according to the design requirements, select a similar system from existing patents and documents as the original system. Secondly, the initial structure is scaled by Zemax optical design and simulation software until it meets the design requirements. Finally, the aberration is optimized and corrected by optimizing the surface shape parameters and modulation transfer function (MTF) curve of the lens. A three-piece photographic objective with a focal length of 30 mm, a half-field angle of 25° and an F number of 4 is obtained. The lens consists of a meniscus convex lens, a biconcave lens and a biconvex lens. The design results show that the whole optical system is symmetrical, simple and compact, with a total axis length of 33.83 mm, and the optical system has a small speckle and the maximum distortion is less than 0.017.