Abstract:Wood chips of 1-72 Poplar were treated with a high pressure steam and pressed into particleboard respectably through the conversion of chemical components．The results are as follows：1.In the intense steam explosion conditions，the cellulose of the chips was degraded remarkably and the explosion yield was lower,and the content of lignin and hot-water extract increased at first and then decreased with a steam pressure increased while the content of free sugar increased；2．By scanning electronic microscopy fibers of the explosion woods were observed to be roughed and broken；3． The crystallinity Was found to be increased by steam explosion；4．Through steam explosion the wood chips could be pressed into particleboard with good water—proof．