Abstract:The experimental resuts of the air permeability, moisture diffusion below the fiber saturation point, adsorption and absorption of water, density, shrinkage and fine structure of the Paulownia genus woods were given in this paper. It was demonstrated that PauIownia wood has permeable and diffusive path for fluid as the other tree species, the movement of fluid through Paulownia wood is by the general mechanism for the fluid permeability and diffusion of wood, and the impregnation and drying rating with fluid or heating of Paulownia wood are moderate. Paulownia wood would not have the ability to resist water, but owing to its low density the percentage of shrinkage or swelling of Paulownia wood is comparatively small, so checks will not be often found in a chest made of Paulownia wood, which is considered with good hermetic seal, and the Paulownia wood has been misunderedstood to have some resistance against water.