Abstract: The relationships between the values of humidity conditioning property parameters x ,y of four kind of interior decorative materials (wall paper, linden plywood, oak floor lumps and smooth MDF on both sides) and the ratio of area to volume A/V, initial moisture content of the specimens, ambient temperature were determined respectively during the period of water vapor flowing in or out. On the basis of these curves, a humidity designing graph under this condition can be obtained to provide theoretical support for designing the humidity of living environment more scientifically and completely.

Key words: Interior decorative materials, Parameter, Humidity designing graph