The law of temperature distribution inside wood using Pinus massoniana as experimental material had been researched during microwave-vacuum drying for the first time. The results showed that, with a certain scope of radiation power (160 kW/m3) and wood thickness (60 mm), temperature distribution inside wood was uniform, and there was not regular temperature gradient along the direction of wood thickness; the inner temperature difference of wood presented a growing trend in the last period of drying; during microwave-vacuum drying, inner temperature difference of wood was caused by microwave fi...