In order to reduce the probability of optical equipment being detected by laser active detection device, the method of oblique image plane is used to weaken the laser echo of optical system. Based on the theory of light transmission and 2-D plane wave angle spectrum diffraction, the distribution characteristics of the diffraction light field of the oblique image surface optical system are analyzed. A visible light optical system with a photosensitive inclined surface to 4 degrees is designed. The system aberration caused by oblique image is corrected by introducing free-form surface. The design results show that at Nyquist frequency 61lp/mm, the optical transfer function of each field of view of the system is higher than 0.58, which is close to the diffraction limit and meets the requirements of imaging quality. The laser echo efficiency of cat’s eye stealth optical system with an oblique image surface of 4 degrees is reduced by more than 50% compared with that of the non-inclined image surface optical system, and the probability of detection of the system is significantly reduced.