Chinese Fir（Cunninghamia lancedata） and Poplar（Populus×euramericana cv.’I-214’） wood flour was liquefied by phenol in the presence of sulfuric acid.The effects of the liquid ratio（quantity ratio of phenol to wood） and catalyst concentration on the wood liquefaction were investigated.The molecular weight and the distribution of liquefied wood were characterized by means of gel permeation chromatography analysis.Results indicated that the residue contents of liquefied Chinese Fir and Poplar decreased as the liquid ratio and concentration of sulfuric acid catalyst increased.On the other hand,the weight average and the weight distribution of the molecular weight of the liquefied wood decreased when the liquid ratio increased,and conversely,began to rise with the addition of more catalyst.