The research on the effects of microwave pretreatment on drying characteristics of three plantation wood species, T. sinensis, C. ovata and C. camphora, was conducted through a series of tests with 100℃-test method. The results showed that : 1. T. sinensis and C. camphora were species easy to dry, but C. ovata is diffi- cult, and its main drying defects were honeycomb and cross section deformation; 2. the grades of initial check, honeycomb, cross section deformation and twist deformation were 3,1 - 2,3,2 and 2,4,4,2 and 2,1 - 2,2,2 3 for T. s...