C-SiC-B4C composites were prepared by using a mixture of phenolic resin binder, SiC,B4C, flake graphite, green coke and calcined pitch coke as the raw materials for uniaxial compression. The influence of the raw materials on the performance and microstructure of C-SiC-B4C composites was investigated. The result has shown that the C-SiC-B4C composites prepared with raw materials of green coke possess excellent compressive strength, while those prepared with raw materials of flake graphite present the lowest resistivity and the best oxidation resistance.