Abstract: SiO₂ / wood hybrid materials were prepared by the method of sol gel using TEOS as inorganic mediumand china fir as raw materials , according to the principle of solvothermal method. The st ructure and property of thehybrid materials were analyzed by FTIR , XRD , TGA and SEM. The result s show that the WPG (weight percentgain) of the wood get s a marked improvement and the hydroxyl groups f rom the hydrolysis of TEOS reacted withthe hydroxyl groups of the wood. In SEM analysis , the network whose size is in nanoscale is found , which resultedf rom the coagulation of Si —O —C network. And in XRD analysis , the crystalline phase of lignocellulose has beendest royed. Meanwhile , the crystallinity decreases from 75. 37 % for pure wood powder to 32. 42 % for 78 % WPGhybrid material. TGA shows that the hybrid materials has a better thermostability. The characteristic degradationtemperature at 10 % mass loss is evidently increased from 270 ℃for pure wood powder to 409 ℃for 78 % WPGhybrid materials.