Vacuum brazing experiments of Cf/C composites were carried out using pure Al and Al-5Ti-B as brazing fillers, and shearing strength of the joints was measured. The microstructures of the brazed joints were studied by means of scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer. The results indicate that the brazing temperature is the important processing parameter affecting the quality of the brazed joints. Vacuum brazing of Cf/C composites can be achieved employing the pure Al and Al-5Ti-B brazing fillers at a brazing temperature of 730 ℃ or 750 ℃, respectively. Moreover, the joints have excellent microstructures with shear strength reaching the level of practical applications.