Ti/Al2O3 composites were synthesized by vacuum hot-pressing sintering, using the following sintering process as sintering temperature is 1420℃, time of heat preservation is 60 minutes, heating rate is 10℃ / min (0-1200℃) and 5℃ / min (1200℃-1420℃). The effects of carbon fiber on the mechanical property of Ti/Al2O3 composites are discussed. The results indicate that the carbon fiber can obviously effect the mechanical property of Ti/Al2O3 composites. When the carbon fiber content is 1.0 vol %, the relative density, micro-hardnessare,flexural strength and fracture toughness of the composite reach the maximum values of 97.62%, （16.6?.32）GPa , （381?1.25）GPa and （7.2?.19）MPa.m 1/2, respectively, and the fracture mode of the composites were optimised.