The C/SiC-SiO₂ composites with different SiO₂/SiC ratios were prepared by sol-gel-PIP process. The effect of SiO₂ content on the microstructure and mechanical properties of the composites was investigated. The results show that the tensile and compressive strength of C/SiC-SiO₂ composites with the mass fraction of SiO₂ no more than 25% are close to those of C/SiC composites. When the mass fraction of SiO₂ added exceeds 25%， the strength and modulus of composites decrease with increasing of SiO₂ content. It is worthy to mention that the fabrication cost of C/SiC-SiO₂ composite with 25% SiO₂ content is 24% lower than that of C/SiC composite， which provides a new technical approach for the rapid and low-cost preparation of C/SiC composites.