Lightweight fine open-cell porous Si/SiC ceramic filter was fabricated using polyurethane sponge. The thickness of the strut and the cell size of porous Si/SiC ceramics were almost the same size of the original sponge. This porous ceramic was an ideal structure for photocatalyst supports. The contact probability between photocatalyst and pollutant could be easily increased by using this ceramic filter coated with photocatalyst. The TOC value of Orange II solution, coloring matter, could decrease remarkably using this photocatalytic ceramic filter and germicidal lamp.