In order to improve the drying quality and get high-value-added wood products from plantation Eucalyptus, microwave treatment for lumber was conducted in this study. The objectives of microwave treatment are to release residue growth stress and to modify the microstructure of E. urophylla lumber. Drying defects such as splitting and collapse can be effectively reduced in lumber drying after microwave treatment. Based on the characteristics of residue growth stress and microstructure of E. urophylla, the mechanism of microwave pretreatment was proposed. At last the research on wood microwave mo...