In order to widely use Eucalyptus urophydis wood, its ether/acetone extractives were identified by Py-GC/MS. The main and abundant constituents of 750°C pyrolysis products were 1, 3-butadiene, 2-methyl-(5.9%), benzofuran, 2, 3-dihydro-(4.11%), 1, 3-butadiene(3.69%), stigmastan-3, 5-diene (3.66%),γ-sitosterol(2.13%), 2-butene, 2, 3-dimethyl-(2.03%), toluene (1.92%), 1, 4-cyclohexadiene, 1-methyl-(1.76%), 1h-indene, 5-butyl-6- hexyloctahydro-(1.73%), 1, 3-cyclohexadiene(1.66%), phenol(1.58%), 1-hexene(1.54%), sulfide, bis(2-cyano-3, 4-dihydro-2, 3,3-trimethyl-2h-pyrrol-5- yl)-(1.46%), ...