By concucting an orthogonal test,effects of NaOH concentration,decreasing temperature and degreasing time on the content of benzene-ethanol extractive of the veneer of Scotch pine were evaluated.The results show that the NaOH concentration,degreasing time and temperature are in inverse proportion to the content of extractive.Analysis of the orthogonal test shows that effects of the NaOH concentration and degreasing time are significant,while the effect of degreasing temperature is trivial.