Abstract: The properties of three types of fibers reinforced SiC composite materials produced by polymer infiltration were compared and the cause of property differences was exposed via analysis of the microstructure of the materials. It was found that SiC matrix composite material reinforced by Hi-Nicalon fibre had the most preferable properties, uni-directional composite material of this type reached a bending strength of 703.6 MPa, and fracture toughness of 23.1 MPa·m^1/2. Composite materials reinforced by JC carbon fibre had preferable properties too, with bending strength of 501.1 MPa, and fracture toughness of 13.8 MPa·m 1/2.