Abstract:In order to clarify the rules of humidity conditioning function of interior wall materials,the temperature,relative humidity and logarithm of absolute humidity in a box (20cm×20cm×30cm),which was constructed of steel plates and lined with an experimental material on its floor,were measured at a certain time when its ambient temperature was changed from 20℃ to 33℃.The experiments showed that the logarithm of h was represented approximately by a linear equation of temperature T,and the degree of humidity conditions could be evaluated by the slope (b) of the equation.The b values were used to classify the tested interior wall materials such as plywood,particleboard,fiberboard and so on.The value b of linden plywood tended to increase nonlinearly with the increasing ratio of the area (A) occupied by the wall material to the volume (V) of the steel box (A/V).The value b of linden plywood covered with polyurethane coating was about 2/3 of the uncovered.At the beginning of the rise of the ambient temperature,the different changing tendency of relative humidity was observed between woodbased materials and synthetic of inorganic ones.