Since the individual use of C/C composite is limited, the joining with other materials becomes a key technology in its application. Brazing is one kind of joining method that has been studied most, maturest and most widely used for C/C composite in recent decades. Nonetheless, there are still many deficiencies in the brazing of C/C composites because of the characteristic of the composite itself, which cannot meet the needs of specific conditions. The current brazing situation of C/C composite is reviewed in this paper. The difficulties of joining C/C composites and metals, the bonding systems that had been studied, and the joining mechanisms are included. The brazing methods and basic joining mechanisms of C/C composite are summarized emphatically, mainly including: direct brazing with active filler materials, using micro-nano particles reinforced or stress buffer layer added composite filler materials, surface modifying of C/C composite, and changing the interface structure, and so on. The current research breakthroughs and remaining problems are analyzed. The feasibility measures of brazing C/C composite are analyzed and summarized to provide basic reference for subsequent research on the brazing of C/C composites and the improvement of joint performance.