Abstract: his paper presents the selection of optical design goals for CCD star sensor. Wavelength range for the system is from 0.48μm to 0.85μm,focal length 75mm, F/1.44, field of view 8.5°.It's a complicated Petzval system. Evaluating image quality of the system with the method of spot diagram energy concentration and deviation of energy centre. Total number of elements of selected CCD is 384 × 288, pixel size 23μm × 23μm. Maximum energy centre deviation in FOV for polychrome spot diagram is 1.6μm,corresponding to 4. 39″.