Carbon fiber was prepared from the extract produced from a rice straw by degradative solvent extraction. The Soluble yield was as high as 56% on carbon basis. First, the Soluble was film distilled at 180 to 220℃ to remove 10 to 15% of small molecular weight compounds, which increased the softening temperature of the Soluble up to 250℃. The treated Soluble was spun by a mono-hole continuous spinner. The spun fiber was stabilized in an air stream by heating it up to 300℃ at the heating rate of 5℃/min, then the stabilized fiber was carbonized in a nitrogen stream at 800℃ to form carbon fiber. The carbon fibers produced were 9 to 12 μm in diameter and had tensile strength over 800 MPa. These preliminary examinations showed the possibility of utilizing Solubles as raw materials of carbon fiber for general purpose.