B 4 C matrix ceramic composites toughened by Al 2 O 3 and TiC were prepared by low pressure hot pressing. The relative density, Vickers hardness, fracture toughness and flexural strength of the new fabricated composites were measured. Microstructure observations of the fracture surfaces and the indentation cracks of the B 4 C matrix ceramic composites were analyzed, and an X-ray diffraction phase analysis was performed. The experiment results showed that chemical reactions took place during the low pressure hot pressing process and resulted in the B 4 C/Al 2 O 3 /TiB 2 composite. The densification rate of the B 4 C matrix ceramic composites was enhanced and the mechanical properties were improved via the introduction of Al 2 O 3 and TiC additives. The Vickers hardness, fracture toughness and flexural strength of the composite with the addition of 4.7wt.% Al 2 O 3 and 10wt.% TiC were 24.8GPa, 4.8MPam 1/2 and 445MPa, respectively.