SiCfiller/SiC ceramic composites were prepared using a SiC powder and a liquid polycarbosiane (PCS) ceramic precursor. Ultra-fine SiC powder (d50: 170nm), prepared by mechanical alloying process, was used to prepare aqueous SiC slurries with the solid loading of 66 - 70 vol%. By the optimization of dispersion condition and the oxidation treatment of the SiC powder, SiC slurry up to 70 vol% solid loading was successfully prepared. The maximum green density of SiC compact after drying the slurry was 78%. Precursor-impregnation & pyrolysis process (PIP) was performed using SMP-10 liquid PCS precursor. The weight of the SiC composites increased almost linearly up to 4 PIP cycles and the mass gain became less efficient afterwards. The 4-point flexural strength of the SiC composites were 204 and 265MPa at 25 and 2,000℃, respectively under argon atmosphere. The result clearly indicates the excvellent thermal stability of the SiC cpmposites fabricated using the PCS precursor.