The result indicated relationship between the provelies of specimen and the parameter of water vapor Permeability. II was fecund that the water yarn permeability resistance of the boundary layer of the specimen increased with increasing temperature as well as the relative humidity. And intrinsic water vapor permeability resistance of specimen was kept constant. On the other hand, the apparent water vapor Permeability resistance was fond to increase with increasing the thickness of the specimen, the temperature, and the relative humidity and to decrease with increasing the air permeability and the awarent density.