In order to detect spectral characteristics, there is a need of designing multispectral bands optics. According to design requirements, the multispectral camera based on acousto-optic tunable filter (AOTF) gating crystal is designed. The zooming design is adopted so as to adapt the resolution requirements at different situations. During the design process, the segmented design is adopted, while the exit pupil and the entrance pupil of the system are matched optimally. The chromatic aberration is corrected and the zooming curve is plotted. All the above provides the basis for the zoom braking project of the future system.