In this paper, B 4 C/(W,Ti)C ceramic composites with different content of solid-solution (W,Ti)C were produced by hot pressing. The effect of (W,Ti)C content on the microstructure and mechanical properties of B 4 C/(W,Ti)C ceramic composites has been studied. Results showed that a chemical reaction took place for this system during hot pressing, and resulted in a B 4 C/TiB 2 /W 2 B 5 composite with high density and improved mechanical properties compared to monolithic B 4 C ceramic. Densification rates of the B 4 C-based ceramic composites were found to be affected by addition of (W,Ti)C. Increasing (W,Ti)C content led to an increase of the densification rates of the composites. The sintering temperature was lowered from 2150 o C for monolithic B 4 C to 1850 o C for the B 4 C/(W,Ti)C composites. The fracture toughness and flexural strength continuously increased with increasing (W,Ti)C content up to 50 wt.%, while the hardness decreased with increasing (W,Ti)C content.