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Corncob powder was liquefied in a high pressure reactor. The composition of the gas and liquid phases produced were analyzed. It was found that the yield of gas phase and liquid phase increased while the yields of solid residue decreased with increasing temperature. The gas phase was 33.4 -49.15% (wt%), the liquid phase 22.6 - 43% (wt%), and solid phase 23.6 - 28.25% (wt%) at 5 - 20 min. Liquid yield increased with the addition of potassium hydroxide. Total liquefaction yield decreased with the increasing of corncob content. The gas phase consisted of hydrogen, carbon dioxide, carbon monoxide, methane, and small amount of hydrocarbon. The liquid phase consisted of cyclic aromatic hydrocarbon, ketone, aldehyde, carboxylic acid, ester, nitrogenated compound and related derivatives.