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As a waste in pulp, the acetone extractives of Eucalyptus urograndis wood severely polluted the water and wasted a lot of bleaching agents. Therefore, Py-GC/MS was used to analyze high-grade bioenergy utilization of acetone extractives of Eucalyptus urograndis wood. The relative content of each component was determined by peak area normalization. 33 compounds in the extractives were identified. The mainly abundant constituents were ergosta-4,6,22-trien-3.alpha.-ol (12.95%), carbon dioxide (12.02%), cyclopentadecanone, 2- hydroxy- (8.21%), .beta.-sitosterol (7.6%), 1,2-benzenediol (5.97%), phenol, 2,6-dimethoxy- (5.45%), R-(-)- cyclohexylethylamine (4.64%), vitamin E (4.51%), phenol, 3,5- diethyl- (4.38%), acetone (4.16%), 4.alpha.-methylcholest-7-en-3- one (3.54%), 1,2,3-benzenetriol (3.33%), 1

As the most abundant renewable forestry resource in South China, Eucalyptus urograndis wood is most suitable for bioenergy. Therefore, Py-GC/MS was used to analyze the components from pyrolysis products of Eucalyptus urograndis wood. After treated with freeze-drying, the comminuted power of Eucalyptus urograndis wood was pyrolyzed in He atmosphere at 590square, then the pyrolysis product was analyzed by online linked GC/MS. Relative content of each component was determined by area normalization, and 38 compounds representing 99.35% were identified. The main and abundant constituents were carbon dioxide (59.93%), ethene, ethoxy- (18.73%), 1,6-anhydro-.beta.-D-glucopyranose (4.58%), phenol, 2-methoxy-4-(l-propenyl)- (4.19%), cedrol (3.14%), thylene oxide (2.33%), glycidol (1.23%), 1H-3a,7-methanoazulene, 2,3,4,7,8,8a-hexahydro-3,6,8,8-tetramethyl- (1.16%), butanal (1.13%), ethanone, 1-phenyl-, oxime (0.59%), and so on. So pyrolysis products of Eucalyptus urograndis wood could be used to bioenergy, bio-pesticides, expensive chemicals, and so on.