This standard specifies a test method for moisture absorption and discharge performance of building materials with Humidity regulation. It applies to interior decoration materials such as Coatings, Putty, Wallpaper and Sheet, as well as Miscellaneous Humidity regulation materials. Terms, definitions, symbols and units are enumerated in the standard, including concepts such as moisture absorption/moisture absorption performance, moisture absorption process, moisture discharge amount, water vapor surface resistance, water vapor penetration resistance and moisture absorption rate.