中文摘要：

以日本柳杉（Cryptomeria japonica Don）为试材,经120、140、180℃,相对湿度为0、60%和100%过热蒸汽处理后,采用X-射线衍射仪进行测试,分析了不同温度及湿度条件对木材相对结晶度的影响。通过正交试验分析得出：高温高湿处理后木材的相对结晶度最大,处理后木材的相对结晶度受温度的影响非常显著,受相对湿度的影响不显著。

英文摘要：

Effects of temperature and relative humidity（RH） on relative crystallinity of wood were discussed in this paper.Specimens from Japanese Sugi（Cryptomeria japonica Don） wood were treated with superheated steam under different temperature （120,140,180 ℃） and different RH （0,60 %,100 %）,and the effects on relative crystallinity of wood was examined by X-ray diffractometer.The highest relative crystallinity was found on specimens treated with the highest temperature and the highest RH by orthogonal experiment analysis.It was found that temperature has more important effect than RH.Variance analysis showed that relative crystallinity depends more significantly on temperature,and less significantly on RH.