Abstract: Through the analysis of the characteristics and development trend of the ultraviolet communication receiving optical system, a method of designing off-axial TMA ultraviolet communication receiving optical system is presented based on coaxial three-reflective optical system. The structural parameters of the system can be solved and optimized by ZEMAX. Then the off-axial three-mirror system with focal length of 998.192 mm, field of view of 4 and F-number of 4 is designed. The modulation transform function (MTF) of field of view is 0.4 at 50 lp/mm, and the full field diffusion plaque is controlled within 5 m. This system overcomes the central shielding problem which exists in coaxial TMA system, thus the image quality of the system is greatly improved. The system design meets the corresponding technical requirements, which is of great significance to successful development of ultraviolet communication system.