Carbon fiber reinforced ceramic matrix composites exhibit excellent properties such as high strength at elevated temperature, excellent thermal conductivity and low density. Therefore, it is considered to be a promising infrared (IR) stealth candidate to replace a traditional metal as exhaust nozzles in propulsion systems for the aircraft to reduce the infrared signature of 3~5 um wavelength. In this study, two dimensional carbon fabrics and polysiloxane based precursors are used to fabricate Cf/SiOC composites. DSC (differential scanning calorimetry) analysis of precursors were investigated to optimize curing conditions for pressing molding. Densification, microstructural development and tensile properties after PIP (polymer impregnation and pyrolysis) process were also discussed.