Abstract: The processing of silicon carbide reinforced with carbon fibre by nmans of polycarbosilane(PC) chemical transformation was studied in this work.The mismatch of thermal expansion coefficient between carbon fibre and silicon carbide matrix was alleviated by the addition of a small amount of zirconia to the matrix.The composite material possesses much improved toughness due to the fibre incorporation.The results of mechanical and thermal experiments show that the composite has good comprehensive properties.