The CODE V optical design software is used to design a TV micrometric lens for a centering item with an inner adjusting focus. The lens is composed of four lenses. It has a symmetric structure with positive and negative focal lengths. Its focal length, numerical aperture and field of view are 17.20 mm, 0.063 and 16.82? respectively. The lens operates in the waveband from 486 nm to 656 nm. Its total optical length is 68 mm. It has the maximum distortion of -1.13% in the full field of view and the modulation transfer function greater than 0.64 at a space frequency of 60 lp/mm. The design result shows that the system has good imaging quality and a compact structure which meet the practical requirements.