Abstract: C/C composites were fabricated in air using mold pressing and semi-carbonization shaping technology. The effects of surface treatment methods for short carbon fibers on the density and mechanical properties of the C/C composites were investigated by an electronic universal testing machine and a scanning electron microscope. Results showed that the compressive strength of the as-fabricated C/C composites increased with an enhancement in intensity of surface treatment for short carbon fibers. The compressive strength of the C/C composites with surface-treated carbon fibers was increased by 138.5％ compared with that of the C/C composites without surface treatment.