Abstract: In order to obtain the two-dimensional spatial information and one-dimensional spectral information within the field of view (FOV) range of 15 from 400 nm to 900 nm, a kind of system for acousto-optic tunable filter (AOTF) imaging spectrometer was designed. The working principle of AOTF was described. According to the overall plan, the fore-optics and post imaging system were finished. The fore-optic system was utilized the inverted Galileo telescope, and the post had an improved-Cooke triplet-structure. Finally the optic system was completed. The focal length is 19.311 mm and the F number is 12.3. While the spatial frequency is 34 lp/mm, the modulation transfer function (MTF) is 0.5.