In order to obtain the image of 7 m resolution with the Chang′E-2 CCD stereoscopic camera on the 100-km-altitude circular orbit, a two-linear array CCD camera stereoscopic mapping optical system is designed. The principle of two-linear array stereo mapping camera is described. According to the satellite requirements, the main parameters of the optical system are calculated detailedly. The focal length of the system is 144.4 mm, the view angle is 42\O, the relative aperture is F/9, and the spectral range is 450~520 nm. The optical system adopts six groups of seven pieces type complicated double Gaussian structure with distortion elimination, for which the average modulation transfer function is 0.67 at 50 lp/mm Nyquist spatial frequency. The 100 km first rail images and polar region image of Chang′E-2 satellite CCD stereoscopic camera are obtained. The images are clear and rich of detail information, demonstrating the effectiveness of the optical system.