The design of a wide-band and large-aperture optical lens for traffic surveillance system is presented. By utilizing the atmospheric window of infrared light, clear images are achieved in the dark or poor visibility conditions. To use near-infrared and visible light to image, the charge coupled device (CCD) is adopted as the image sensor of the lens with pixel size of 4.65 μm and limiting resolution of 110 lp/mm. F-number of the lens is 1.6, the field of view (FOV) is 16.8°, the center wavelength is 880 nm and the operating wavelength range is from 400 nm to 1000 nm. After calculating the parameters of optical lens, Sunnah type is selected as the initial structure. Through optimization, the lens has an excellent imaging performance. The modulation transfer function (MTF) is more than 0.3 at the spatial frequency of 110 lp/mm, and the maximum distortion is less than 0.1%.